Computer seems to boot up, but no signal goes to the monitor and the keyboard LED's don't light up.

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Gabmor

Commendable
Jun 22, 2016
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0
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I was previously having a problem where the computer would freeze, I would force shut it down, and then try to power it back on, and it would be in a continuous loop of trying to boot and not being able to. I was then given the idea to replace the circular battery on the motherboard and that seemed to work for a while. It then cut out again and started doing the same boot loop. When I tried replacing the battery again, it seemed to boot up mostly, except it was sending no signal to the monitor and the keyboard LED's. Sometimes it'll boot all the way and then cut out again soon, and sometimes it'll go back into the boot loop.

I'm thinking it could be a motherboard issue, since tampering with the motherboard fixed the original boot loop for a while, but I don't want to pull the trigger on a new motherboard if that isn't the issue.

Any advice would be greatly appreciated. Thanks!

 
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bjornl

bjornl

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Mar 16, 2016
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It sure sounds like the MB is going. If I were to guess I'd say your BIOS is bad. If your MB is a dual bios MB, try enabling the 2nd one.

Another consideration is that the MB bios battery should not go out that fast. They typically last for years. If you have replaced it twice in a short span it could also be a short on the MB.

But for trouble shooting, I'd begin by stripping it down. Control your variables. This means as few parts connected as possible. To test BOOT you just need the smallest amount of ram that your MB supports, video and a working CPU.


So turn off your PC and remove the power cable.
Open your PC. Get your phone and take some photos of where everything is.
Disconnect everything you can (USB devices, check your motherboard manual for the smallest amount of ram it supports and remove the rest, unplug hard drives, optical drives, the front USB panel. If your MB has onboard video, remove the video card and use the onboard.

Next check the seating of the cables. If you are still using a video card which has power make sure that both the card and cables are well seated.
Same with the power cables to the MB.

Reconnect the power cable and try to boot to BIOS.

If it boots to BIOS, then item by item add things back until the problem comes back.

If it won't boot to BIOS look to see the CPU is getting power (CPU fan moves, light on MB comes on). If you have a 2nd compatible PC try and test the components one at a time. Start with the PSU.
 
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