Pc Turns Off and on Again While
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- January 7, 2011
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- xviii,510
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What's happening is when I attempt to start the computer, it turns on and shuts off immediately. Case fans, CPU fan, GCard fan, case LEDs and PSU fan all turn on for that one-half second. If I press the power push button again, zilch happens..
The only mode I tin can get it to attempt to startup over again is if I flip the ability supply off and on again, but information technology withal does the aforementioned matter. Oddly, if I try it over and once again plenty times, it will eventually boot and run. I can restart the computer from Windows and information technology restarts fine, only if I shut it on and off it notwithstanding has that same issue. It has come up downward to flipping my ability supply on/off a hundred times trying to get it to start with it eventually working.
This happened randomly after owning my reckoner for nigh 5 months, aught changed whatsoever, I only tried turning it on one day and it happened. I'm not sure if it'southward just me simply it seems to exist getting worse and worse. I have tried different outlets, cleaning out everything, and unplugging all other cords except the power cord. Information technology'south non the power button itself either..
A strange thing that happens is if I turn my PSU off, unplug information technology, plough it on, and push the power button, information technology will do the split-second turn on. If I turn the PSU off and on again subsequently that, when I push the ability button it will run everything for about three times longer than usual (about a second).
AMD Phenom 965 @ iii.4 ghz
2 x 2gb Gkill
XFX Radeon 5770
OCZ 700w PSU
Asrock 790gx mobo
Sunbeam Transformer Case
- Jul fourteen, 2004
- 16,893
- 6
- 52,960
- 759
- #6
Not true. When you lot turn a PSU on, but the small 5 volt standby power supply is working. The principal power section is off with discharged capacitors. When you plough on the PSU with the case switch, the PSU starts to cycle upwardly. When the main voltages reach operating levels, the PSU sends a control signal to the CPU telling it that the PSU is fully on and information technology is OK to kicking.
Work systematically through our standard checklist and troubleshooting thread:
https://forums.tomshardware.com/threads/perform-these-steps-before-posting-nigh-postal service-boot-no-video-bug-sticky-updates.3528107/
I hateful piece of work through, non only read over information technology. We spent a lot of fourth dimension on this. It should discover nigh of the problems.
If not, read on.
I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a unmarried short beep for a successful Postal service.
Breadboard - that will help isolate whatsoever kind of case trouble you might have.
http://world wide web.tomshardware.com/forum/262730-31-breadboarding
Breadboard with just the motherboard, CPU & HSF, case speaker, and PSU.
Make certain y'all plug the CPU power cable in. The organisation will non boot without it.
I always breadboard a new build. It takes only a few minutes, and you lot know yous are putting adept parts in the example in one case you lot are finished.
You lot tin can plow on the PC by momentarily shorting the 2 pins that the case ability switch goes to. Y'all should hear a serial of long, single beeps indicating memory problems. Silence indicates a problem with (in about likely order) the PSU, motherboard, or CPU. Remember, at this time, you do not have a graphics card installed and so the load on your PSU will exist reduced.
If no beeps:
Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absenteeism of a single curt beep, they besides exercise not indicate that the arrangement is booting.
At this point, y'all tin can sort of check the PSU. Endeavor to borrow a known good PSU of around 550 - 600 watts. That will ability just about any system with a single GPU. If you cannot practice that, use a DMM to measure the voltages. Measure out between the colored wires and either chassis footing or the black wires. Yellowish wires should be 12 volts. Ruby wires: +5 volts, orange wires: +3.three volts, blue wire : -12 volts, violet wire: 5 volts ever on. Tolerances are +/- five% except for the -12 volts which is +/- ten%.
The greyness wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.
You lot can plow on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to brusque the light-green wire to one of the neighboring black wires.
View: http://www.youtube.com/watch?v=5FWXgQSokF4&feature=youtube_gdataA manner that might exist easier is to use the main power plug. Working from the back of the plug where the wires come out, apply a bare paperclip to short between the green wire and ane of the neighboring blackness wires. That will practice the same thing with an installed PSU. It is also an easy mode to bypass a questionable case power switch.
This checks the PSU under no load conditions, and so it is not completely reliable. But if it can not pass this, information technology is expressionless. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.
If the system beeps:
If it looks like the PSU is adept, install a retention stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics bill of fare.
Silence, long single beeps, or series of brusk beeps bespeak a trouble with the retentiveness. If you lot get short beeps verify that the retention is in the appropriate motherboard slots.
Insert the video carte du jour and connect any necessary PCIe power connectors. Boot. At this indicate, the arrangement should POST successfully (a single curt beep). Notice that yous do not need keyboard, mouse, monitor, or drives to successfully POST.
At this point, if the system doesn't work, information technology's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.
Now, start connecting the rest of the devices starting with the monitor, then keyboard and mouse, and then the rest of the devices, testing after each footstep. It's possible that y'all tin laissez passer the POST with a defective video card. The POST routines tin just check the video interface. It cannot bank check the internal parts of the video card.
- #two
- Jan 7, 2011
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- xviii,510
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- #3
Yes.Just putting it out in that location, did you endeavor turning it on with the PSU switched the other manner?
- Dec 21, 2009
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- #iv
- Jan seven, 2011
- 10
- 0
- 18,510
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- #v
Just tried it and nix
- Jul 14, 2004
- 16,893
- half dozen
- 52,960
- 759
- #6
Not true. When you plow a PSU on, only the minor 5 volt standby power supply is working. The chief power section is off with discharged capacitors. When you turn on the PSU with the example switch, the PSU starts to cycle up. When the principal voltages reach operating levels, the PSU sends a control signal to the CPU telling information technology that the PSU is fully on and it is OK to kicking.
Piece of work systematically through our standard checklist and troubleshooting thread:
https://forums.tomshardware.com/threads/perform-these-steps-before-posting-most-post-boot-no-video-problems-sticky-updates.3528107/
I mean work through, not but read over it. We spent a lot of time on this. Information technology should find most of the problems.
If not, read on.
I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.
Breadboard - that will help isolate any kind of case problem you might have.
http://world wide web.tomshardware.com/forum/262730-31-breadboarding
Breadboard with only the motherboard, CPU & HSF, case speaker, and PSU.
Make sure yous plug the CPU power cable in. The system volition not boot without it.
I always breadboard a new build. It takes simply a few minutes, and you know you are putting good parts in the example once you lot are finished.
You lot can turn on the PC past momentarily shorting the 2 pins that the case ability switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a trouble with (in most likely order) the PSU, motherboard, or CPU. Remember, at this fourth dimension, you practice not accept a graphics carte installed so the load on your PSU will be reduced.
If no beeps:
Running fans and drives and motherboard LED'southward exercise not necessarily indicate a proficient PSU. In the absence of a unmarried short beep, they as well do not betoken that the system is booting.
At this indicate, you can sort of check the PSU. Try to borrow a known practiced PSU of around 550 - 600 watts. That volition power just about whatsoever system with a single GPU. If you cannot do that, use a DMM to mensurate the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Crimson wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- x%.
The gray wire is really important. It should become from 0 to +5 volts when y'all plow the PSU on with the case switch. CPU needs this indicate to boot.
You tin plough on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to brusque the dark-green wire to ane of the neighboring black wires.
View: http://www.youtube.com/spotter?v=5FWXgQSokF4&feature=youtube_gdataA fashion that might be easier is to employ the main power plug. Working from the back of the plug where the wires come out, apply a bare paperclip to short between the light-green wire and one of the neighboring blackness wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.
This checks the PSU nether no load weather condition, so it is not completely reliable. But if information technology tin not pass this, it is dead. And then echo the checks with the PSU plugged into the computer to put a load on the PSU.
If the organisation beeps:
If it looks like the PSU is skilful, install a memory stick. Boot. Beep pattern should change to one long and several brusk beeps indicating a missing graphics card.
Silence, long single beeps, or series of short beeps indicate a trouble with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.
Insert the video card and connect any necessary PCIe ability connectors. Boot. At this point, the arrangement should Post successfully (a single short beep). Find that you do not need keyboard, mouse, monitor, or drives to successfully Postal service.
At this point, if the organisation doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.
Now, start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the remainder of the devices, testing after each step. Information technology's possible that y'all can pass the POST with a lacking video bill of fare. The Mail service routines can merely check the video interface. Information technology cannot check the internal parts of the video card.
- Jan xiv, 2006
- 16,205
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- #seven
- Jan vii, 2011
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- 18,510
- 0
- #viii
- Jan 7, 2011
- 10
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- 18,510
- 0
- #9
- Oct 19, 2010
- one,489
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- xix,360
- 42
- Jan seven, 2011
- 10
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- 18,510
- 0
- #11
- Nov 26, 2011
- one
- 0
- 18,510
- 0
- #12
- December 27, 2011
- 1
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- eighteen,510
- 0
- #13
took out cardboard and retightened screws, aforementioned problem occurred. loosened srews half plow and worked again. problem is the mobo is shorting out on the case because it was tightened to tight to the case. Dorsum off your srews in the mobo to the example a half turn and you should be proficient. worst instance keep the thin piece of cardboard under the mobo and srew mobo back down therefore iliminating short. have fun!!!no stress
- Feb 15, 2012
- one
- 1
- 18,510
- 0
- #14
I had the aforementioned trouble with my computer. I got some communication from an It good....well my situation was exactly similar yours i.e turn on comp, all lights and fans turn on and turns off one second later.
Solution:
ane. Disconnect all power cables and monitor cables
two. Pull out all the ram from each of their ram slots (northward.b make sure you put it back in the aforementioned society aswell)
3. There is a button blazon bombardment located somewhere on the motherboard, have a look for it and simply pull or popular it out.
4. Flip the battery upside down and put information technology back into the motherboard
five. Put all the ram back into their slots in the same order you took them out
vi. Push button the ability push and go on pushing the ability push continuously until y'all hear the hdd and other stuff kick it (push it peradventure 5-10 or so times)
7. The cpu should hold out and you should hear the beep and the calculator should load something where it prompts yous to continue or setup (the usual stuff)
8. Press the button that says proceed. In my case i have an AMD and it said "press F1 to continue"
Allow me know how it goes 
goodluck
- Sep 3, 2006
- 59,465
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- #15
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