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Computer won't turn on, lights flash once/fans spin, what could be wrong?

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  • Light
  • Flash
  • Systems
  • Computers
Last response: in Systems
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August 6, 2013 3:31:19 PM

I tried resetting the CMOs manually but that doesn't do the trick. The PSU and mobo are new and I had this problem a while back, however the computer started booting normally afterwards. Now it's randomly reverted to the point where I'm unable to turn it on at all.

What could cause this problem, any way to figure that out or maybe even fix it?

mobo: ASRock Z75 Pro3
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

CPU: Intel i5 2400
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

gfx card: HIS Radeon HD 7770
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

RAM: Gskill Ares 4GB RAM *2
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

SSD: Corsair Force Series 3 60GB
Discontinued as far as I can see, no longer in stock on newegg.

Woops! You're right, totally sorry forgot about the PSU.

Corsair CX600M
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

More about : computer turn lights flash fans spin wrong

August 6, 2013 3:36:30 PM

If possible, I would get the PSU tested. Perhaps the "power good" signal isn't being sent by the power supply anymore?

Can you swap another PSU in as a quick test?

I noticed you didn't list your PSU with the rest of your components...
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August 7, 2013 8:15:50 AM

avatarair said:
I tried resetting the CMOs manually but that doesn't do the trick. The PSU and mobo are new and I had this problem a while back, however the computer started booting normally afterwards. Now it's randomly reverted to the point where I'm unable to turn it on at all.

What could cause this problem, any way to figure that out or maybe even fix it?

mobo: ASRock Z75 Pro3
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

CPU: Intel i5 2400
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

gfx card: HIS Radeon HD 7770
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

RAM: Gskill Ares 4GB RAM *2
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

SSD: Corsair Force Series 3 60GB
Discontinued as far as I can see, no longer in stock on newegg.

Woops! You're right, totally sorry forgot about the PSU.

Corsair CX600M
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


bigpinkdragon286 said:
If possible, I would get the PSU tested. Perhaps the "power good" signal isn't being sent by the power supply anymore?

Can you swap another PSU in as a quick test?

I noticed you didn't list your PSU with the rest of your components...


I'm afraid I don't have another PSU to test with, really.I mean I have a 300w PSU somewhere, but it's been banged up since I removed it and wouldn't it possibly damage the system if I used such a low power PSU to power up? unsure :s.

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August 7, 2013 2:00:03 PM

Damage the system? I doubt it. Damage from a power supply usually occurs when it blows up like a firecracker. It doesn't usually require that much to power up a system, and looking at your specs, you may get away with running on a supply like that for even a short while. All you're really interested in is about a 60 second run, just to show you whether or not you can POST and run the system with a different PSU. If that's the case, you have found the culprit and can easily get the problem sorted. :-)
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August 7, 2013 3:24:58 PM

bigpinkdragon286 said:
Damage the system? I doubt it. Damage from a power supply usually occurs when it blows up like a firecracker. It doesn't usually require that much to power up a system, and looking at your specs, you may get away with running on a supply like that for even a short while. All you're really interested in is about a 60 second run, just to show you whether or not you can POST and run the system with a different PSU. If that's the case, you have found the culprit and can easily get the problem sorted. :-)


Well, after unplugging the current PSU and plugging in the old PSU to just the MOBO/CPU/Gfx card, nothing happened.

However, after I plugged in the new PSU to my system, it seems that power is getting through again- however now it seems that the mobo isn't giving out a display :s. I think it seems pretty certain that the mobo is the faulty part now, unless I'm wrong. Not sure what would've caused the corsair to start everything up again though.
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August 8, 2013 1:13:51 AM

Umm, you have both on-board video from the processor and a discrete graphics card. Have you tried both for video output?
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