Computer Turns on Then Back Off and Then Stays on After Hitting the Power Button Again
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- January 7, 2011
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What's happening is when I effort to start the computer, it turns on and shuts off immediately. Example fans, CPU fan, GCard fan, case LEDs and PSU fan all plow on for that one-half 2nd. If I printing the power push over again, nothing happens..
The just fashion I can get it to endeavour to startup again is if I flip the ability supply off and on again, but it still does the aforementioned thing. Oddly, if I effort it over and once again enough times, it will somewhen boot and run. I can restart the computer from Windows and information technology restarts fine, but if I shut it on and off it even so has that same effect. It has come down to flipping my power supply on/off a hundred times trying to go information technology to start with it eventually working.
This happened randomly after owning my figurer for about 5 months, nothing changed whatsoever, I just tried turning it on 1 day and it happened. I'm not sure if it's merely me merely it seems to be getting worse and worse. I accept tried different outlets, cleaning out everything, and unplugging all other cords except the ability cord. It's not the power push button itself either..
A strange matter that happens is if I turn my PSU off, unplug it, plough it on, and push button the ability push, it volition do the divide-second turn on. If I turn the PSU off and on again after that, when I push the power button it will run everything for nigh three times longer than usual (about a second).
AMD Phenom 965 @ iii.4 ghz
two 10 2gb Gkill
XFX Radeon 5770
OCZ 700w PSU
Asrock 790gx mobo
Sunbeam Transformer Case
- Jul 14, 2004
- sixteen,893
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- #6
Not true. When you turn a PSU on, merely the small 5 volt standby ability supply is working. The main power section is off with discharged capacitors. When you turn on the PSU with the instance switch, the PSU starts to cycle upwardly. When the principal voltages reach operating levels, the PSU sends a command signal to the CPU telling it that the PSU is fully on and information technology is OK to kick.
Piece of work systematically through our standard checklist and troubleshooting thread:
https://forums.tomshardware.com/threads/perform-these-steps-before-posting-near-post-kicking-no-video-bug-sticky-updates.3528107/
I hateful work through, not merely read over it. We spent a lot of time on this. It should find near of the problems.
If non, read on.
I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may exist different, only they all use a unmarried brusque beep for a successful Post.
Breadboard - that will aid isolate whatever kind of example problem y'all might accept.
http://www.tomshardware.com/forum/262730-31-breadboarding
Breadboard with just the motherboard, CPU & HSF, case speaker, and PSU.
Make sure you plug the CPU power cablevision in. The system will not kick without it.
I always breadboard a new build. It takes merely a few minutes, and you know you are putting good parts in the case once yous are finished.
You can plough on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a serial of long, single beeps indicating memory bug. Silence indicates a problem with (in most likely gild) the PSU, motherboard, or CPU. Remember, at this time, you do not accept a graphics card installed then the load on your PSU will be reduced.
If no beeps:
Running fans and drives and motherboard LED's practice not necessarily indicate a skilful PSU. In the absence of a unmarried brusque beep, they also practice not point that the organisation is booting.
At this point, you can sort of check the PSU. Attempt to infringe a known practiced PSU of around 550 - 600 watts. That volition power simply about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should exist 12 volts. Scarlet wires: +5 volts, orangish wires: +iii.3 volts, bluish wire : -12 volts, violet wire: 5 volts e'er on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.
The gray wire is actually important. It should become from 0 to +5 volts when you plough the PSU on with the example switch. CPU needs this signal to boot.
You can plough on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to i of the neighboring blackness wires.
View: http://www.youtube.com/lookout man?v=5FWXgQSokF4&feature=youtube_gdataA way that might be easier is to employ the principal ability plug. Working from the dorsum of the plug where the wires come up out, apply a bare paperclip to brusque between the greenish wire and ane of the neighboring black wires. That volition practise the same thing with an installed PSU. Information technology is also an like shooting fish in a barrel manner to bypass a questionable instance power switch.
This checks the PSU under no load conditions, then information technology is non completely reliable. But if it can not pass this, it is dead. Then repeat 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 practiced, install a memory stick. Boot. Beep design should modify to one long and several short beeps indicating a missing graphics card.
Silence, long unmarried beeps, or series of short beeps indicate a problem with the memory. If you get curt 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 system should Mail service successfully (a single brusque beep). Notice that you exercise not need keyboard, mouse, monitor, or drives to successfully POST.
At this point, if the arrangement doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.
Now, start connecting the residual of the devices starting with the monitor, and then keyboard and mouse, then the rest of the devices, testing later on each stride. It's possible that you can laissez passer the Postal service with a lacking video carte du jour. The POST routines can only cheque the video interface. It cannot cheque the internal parts of the video card.
- #2
- January vii, 2011
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- xviii,510
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- #3
Yes.Just putting it out in that location, did you try turning it on with the PSU switched the other manner?
- Dec 21, 2009
- 4,072
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- 23,160
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- #4
- Jan vii, 2011
- 10
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- eighteen,510
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- #5
Just tried it and naught
- Jul xiv, 2004
- 16,893
- 6
- 52,960
- 759
- #half-dozen
Not true. When you turn a PSU on, only the pocket-sized five volt standby ability supply is working. The main power section is off with discharged capacitors. When you turn on the PSU with the example switch, the PSU starts to bicycle up. When the main voltages reach operating levels, the PSU sends a control point to the CPU telling it that the PSU is fully on and it is OK to kick.
Work systematically through our standard checklist and troubleshooting thread:
https://forums.tomshardware.com/threads/perform-these-steps-before-posting-about-post-boot-no-video-problems-viscid-updates.3528107/
I hateful work through, not merely read over it. We spent a lot of time on this. It should find nearly 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 curt beep for a successful Mail service.
Breadboard - that will help isolate whatsoever kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboarding
Breadboard with but the motherboard, CPU & HSF, case speaker, and PSU.
Make sure y'all plug the CPU power cable in. The system will not kicking without it.
I always breadboard a new build. It takes only a few minutes, and you know you lot are putting good parts in the case one time you are finished.
You tin turn on the PC by momentarily shorting the two pins that the case ability switch goes to. Yous should hear a serial of long, single beeps indicating memory problems. Silence indicates a trouble with (in nigh likely social club) the PSU, motherboard, or CPU. Remember, at this time, you practise not have a graphics card installed so the load on your PSU will be reduced.
If no beeps:
Running fans and drives and motherboard LED'southward do non necessarily betoken a skillful PSU. In the absence of a single brusk beep, they also practise not betoken that the system is booting.
At this point, yous tin can sort of check the PSU. Attempt to borrow a known good PSU of around 550 - 600 watts. That will power just almost any organization with a single GPU. If you lot cannot do that, use a DMM to measure out the voltages. Measure between the colored wires and either chassis basis or the black wires. Xanthous wires should exist 12 volts. Red wires: +5 volts, orangish wires: +3.3 volts, blue wire : -12 volts, violet wire: v volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.
The gray wire is really important. Information technology should go from 0 to +v volts when you plough the PSU on with the case switch. CPU needs this signal to boot.
You lot tin plow on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
View: http://www.youtube.com/watch?v=5FWXgQSokF4&feature=youtube_gdataA way that might be easier is to use the main power plug. Working from the dorsum of the plug where the wires come out, use a blank paperclip to short betwixt the green wire and one of the neighboring black wires. That will practise the same thing with an installed PSU. It is as well an easy way to bypass a questionable instance power switch.
This checks the PSU under no load conditions, then it is not completely reliable. But if information technology can not pass this, it is dead. And then repeat the checks with the PSU plugged into the computer to put a load on the PSU.
If the organization beeps:
If it looks like the PSU is good, install a memory stick. Kick. Beep blueprint should modify to one long and several short beeps indicating a missing graphics card.
Silence, long unmarried beeps, or series of short beeps indicate a problem with the memory. If you lot get short beeps verify that the retentivity is in the appropriate motherboard slots.
Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the organisation should Mail service successfully (a single curt beep). Notice that yous exercise not need keyboard, mouse, monitor, or drives to successfully Mail service.
At this signal, if the system doesn't piece of work, information technology'south either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.
Now, start connecting the balance of the devices starting with the monitor, and then keyboard and mouse, then the rest of the devices, testing afterwards each footstep. It's possible that you tin can pass the POST with a defective video card. The Mail routines tin only check the video interface. Information technology cannot check the internal parts of the video card.
- Jan 14, 2006
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- #7
- Jan 7, 2011
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- #viii
- Jan 7, 2011
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- #ix
- Oct 19, 2010
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- Jan seven, 2011
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- Nov 26, 2011
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- Dec 27, 2011
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took out paper-thin and retightened screws, aforementioned problem occurred. loosened srews half plow and worked again. problem is the mobo is shorting out on the example because it was tightened to tight to the case. Back off your srews in the mobo to the instance a half plow and you should be skillful. worst case proceed the sparse piece of cardboard under the mobo and srew mobo back down therefore iliminating curt. accept fun!!!no stress
- February 15, 2012
- 1
- 1
- 18,510
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- #fourteen
I had the same trouble with my computer. I got some advice from an It skilful....well my state of affairs was exactly like yours i.e turn on comp, all lights and fans plow on and turns off i second afterwards.
Solution:
1. Disconnect all power cables and monitor cables
2. Pull out all the ram from each of their ram slots (due north.b make certain you put it back in the same guild aswell)
3. There is a button type battery located somewhere on the motherboard, accept a look for information technology and only pull or pop it out.
four. Flip the bombardment upside down and put information technology back into the motherboard
5. Put all the ram dorsum into their slots in the same club you took them out
6. Push button the power push button and keep pushing the ability push button continuously until you hear the hdd and other stuff boot it (push button it maybe 5-10 or so times)
vii. The cpu should hold out and you should hear the beep and the reckoner should load something where it prompts y'all to continue or setup (the usual stuff)
8. Press the button that says continue. In my case i accept an AMD and information technology said "printing F1 to continue"
Let me know how it goes 
goodluck
- Sep 3, 2006
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