Pc turns on for 1 sec then shuts off

[FearfulSPARTAN]

Hi I just recently built a pc a little over two weeks ago and just today when I turn it on all the fans spin for about one second and then it all shuts off, then about three seconds later it all spins up again then stops on a loop. I have a feeling it might be the PSU and that's what one of my friends thinks. Just wanted to ask what you guys think it could be.

 

[thestrangebrew1]

Hi I just recently built a pc a little over two weeks ago and just today when I turn it on all the fans spin for about one second and then it all shuts off, then about three seconds later it all spins up again then stops on a loop. I have a feeling it might be the PSU and that's what one of my friends thinks. Just wanted to ask what you guys think it could be.

Might want to list your specs.

 

[FearfulSPARTAN]

Mobo, Asrock h61m-dgs
CPU, core I3 2105
PSU, rosewill hive 550 watt
SSD, Samsung 840 120gb
Case, rosewill redbone

 

[Binky]

Is there anything non-essential connected? If yes, disconnect anything you can to rule it out as a cause.

Did it ever run? You said recently built, but you didn't say that it worked.

You can try my absurd cure - disconnect it all then put it back together. You'd be surprised how many times this has worked for me, but most of my computer work is done after a few beers (beer not recommended).

 

[FearfulSPARTAN]

Is there anything non-essential connected? If yes, disconnect anything you can to rule it out as a cause.

Did it ever run? You said recently built, but you didn't say that it worked.

You can try my absurd cure - disconnect it all then put it back together. You'd be surprised how many times this has worked for me, but most of my computer work is done after a few beers (beer not recommended).

Iv been running it for two weeks now without any problems till now

I also only have a mouse and keyboard plugged in besides monitor

 

[Binky]

Well, since it ran before, the best thing to do is probably clear the CMOS and see if it boots then. Pull the computer power plug and find the clear CMOS jumpers (see MB manual). You generally move the jumper from pins 1-2 to 2-3 (or something like that), then wait a few seconds, then return the jumper to the original position. That will reset the bios to 100% standard settings.

Don't plug in the power with the CMOS jumper in the clear position. ALWAYS return it to the normal position.

If that doesn't work, then it might be the power supply or the motherboard. It's easier to test a new power supply first.

 

[Wreckdumb]

if the CMOS clear doesnt work, i recently bought a GA-z77x-ud5p and it wouldnt boot. after flipping the PSU power switch, the power button would flash on for half a second. after changin the CMOS battery(little silver circle on the mobo) my new board had no trouble starting up. you could try that. about $5.00 at a walgreens.

 

[FearfulSPARTAN]

Well, since it ran before, the best thing to do is probably clear the CMOS and see if it boots then. Pull the computer power plug and find the clear CMOS jumpers (see MB manual). You generally move the jumper from pins 1-2 to 2-3 (or something like that), then wait a few seconds, then return the jumper to the original position. That will reset the bios to 100% standard settings.

Don't plug in the power with the CMOS jumper in the clear position. ALWAYS return it to the normal position.

If that doesn't work, then it might be the power supply or the motherboard. It's easier to test a new power supply first.

Hi I tried it and it didn't work, I can use my friends PSU to see if its that but it won't be for few days until I see him

 

[thestrangebrew1]

Hopefully it's just a faulty PSU and you can replace it with another 1. I don't know the brand too well for PSUs, I usually stick with antecs or Corsairs. But with the specs you listed, 550w should be plenty. You didn't list a gpu, but based on what was listed it is plenty. Update the thread when you get your hands on a psu and can test it.

 

[Vinwiesel]

Disconnect anything non-essential inside the case too. It doesn't even have to be fully functional for testing, so you can disconnect all hdd's, video, etc. I found one of the little EMI tabs got bent and shorted to the motherboard once. Another time I had a loose molex plug work its way onto an EMI tab as well, and short out.

When a power supply comes on for a second and shuts down, it's usually because it detects an overcurrent condition on on of the voltages. Did you power up the supply by itself, with nothing connected? You just have to jumper the green/PS-on wire to ground.

Also make sure everything is seated properly, such as your memory and Video card being fully plugged in and latched. Like was said before, disassemble and reassemble sometimes works, usually because something wasn't quite right. Especially with flimsy cheap cases.

 

[FearfulSPARTAN]

Disconnect anything non-essential inside the case too. It doesn't even have to be fully functional for testing, so you can disconnect all hdd's, video, etc. I found one of the little EMI tabs got bent and shorted to the motherboard once. Another time I had a loose molex plug work its way onto an EMI tab as well, and short out.

When a power supply comes on for a second and shuts down, it's usually because it detects an overcurrent condition on on of the voltages. Did you power up the supply by itself, with nothing connected? You just have to jumper the green/PS-on wire to ground.

Also make sure everything is seated properly, such as your memory and Video card being fully plugged in and latched. Like was said before, disassemble and reassemble sometimes works, usually because something wasn't quite right. Especially with flimsy cheap cases.

I actually fixed it, when my friend and I were building it we were trying to allign the motherboard with the flimsy metal back plate and we thought we finally got it however there was one mobo screw that wouldent screw in so we didnt see the harm and left it out. But when I unscrewed the motherboard and pulled out the back plate and left it out I put all the screws in and then it powered on. I know this may sound stupid but I really didnt think psus or mobos were that sensitive but thanks to everyone here who commented.

 

[max347]

I actually fixed it, when my friend and I were building it we were trying to allign the motherboard with the flimsy metal back plate and we thought we finally got it however there was one mobo screw that wouldent screw in so we didnt see the harm and left it out. But when I unscrewed the motherboard and pulled out the back plate and left it out I put all the screws in and then it powered on. I know this may sound stupid but I really didnt think psus or mobos were that sensitive but thanks to everyone here who commented.

Yup, sounds like the board was shorting against the backplate.

 

[Binky]

You can try my absurd cure - disconnect it all then put it back together. You'd be surprised how many times this has worked for me, but most of my computer work is done after a few beers (beer not recommended).

Ha!