No signal, CPU fan not running, No beep

May 3, 2009 at 20:38:18
Specs: Windows XP SP2

Just bought a new computer (built everything ok) but I'm getting no signal from monitor, No beep from mobo and cpu fan isnt working.

The monitor, graph card etc work on this old computer but I'm stumped as to how to identify whether its the mobo or cpu...

Thanks for yer time. Here's the specs:

Processor: core 2 duo 8400 3ghz 6mb cache
Motherboard: ep45-ud3l gigabyte motherboard
Graphics Card: 9800GT/PCI-E 1gb ddr3
Hard Drive: 1TB Corsair 32m
Ram: 4gb Corsair DDR2
Power: 720W Gigabyte 12V
DVD Burner: LG Sata
Case: Antec mini tower

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May 3, 2009 at 21:09:32
That doesn't make sense. Did you buy a computer or did you build a computer? And since it doesn't work, how is everything OK?

If you built it yourself & didn't benchtest your components before installing them in the case, that was a huge mistake on your part. Gut the case & start from scratch.

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May 3, 2009 at 22:07:51
Check every wirings on the mother board and the power cords of the tower. They might be just loose connections.

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May 3, 2009 at 23:26:23
I built it from scratch. Everything brand new from their boxes.
Not sure how to bench test motherboard or CPU.
I've tried to isolate the problem by running a different hard drive, testing graphics card, and unplugging everything and replugging. I believed the install to be ok, I just dont know which device is not working properly or how to determine what else could be the problem.

thanks for your replies.

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Related Solutions

May 4, 2009 at 18:55:15
Well I've exhausted all i can think of but here's a post i found relating to my issue:

>The processor cannot be faulty but still if you want to check it, remove the CPU Cooler fan. Then turn on the PC.
>Place your finger on the processor for 2 seconds. You should find the processor heating up. Then turn it off immediately. If this works then your processor is good.
>Remember not to leave it ON for more than 5 secs.

The lights on my mobo and all other peripherals seem to be working ok (not sure about the ram tho - I've tried both 1 x 2gig stick as well as both 2gig sticks)

But I felt the cpu with the fan off (which isnt working other than a brief flicker on turning power on and off) after a few seconds and it's still stone cold.

Does this mean its the cpu that isn't working or could there be a power, ram or mobo issue that im overlooking?

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May 4, 2009 at 23:30:07
A super techno mate just diagnosed the problem in around 2 seconds flat:

Solution: there is a second 4 pin power socket in newer motherboards like mine that i hadnt plugged the power into.

Cheers Kane

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