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computer wont post/boot after removing motherboard

Last response: in Motherboards
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June 13, 2014 5:45:41 AM

Hello,

I am upgrading my computer, so i decided to use the processor from the computer I'm upgrading and put it into an older PC. I was also going to swap the motherboard, but after removing both of them they were not compatible, but the processors are.

I replaced the motherboards, and swapped the CPU's and found that the computer fans turn on, the light on the mb is on, and the heat sink fan runs full blast. I get no signal on the monitor.

I removed the video card and tried the on board graphics, didnt work.

I removed the battery to reset the bios, didnt work.

I used a different psu, didnt work.

So i decided to put them both back the way they were when I started, as both were working. They both act exactly the same. One is a dell, and the power light is amber. I tested the cpu's to make sure i didnt damage them in a third PC, they work.

Pins on the motherboard are straight, none bent.

Seems like i am just missing something simple any ideas?
June 13, 2014 7:33:14 AM

Yes, thank you for the link.

I read it all and am confident it is all verified. Like i said I put everything back the way it was initially before i had taken anything apart. I have ruled out the video card, ram, psu, and cpu as the problem by testing on a third working machine. I feel I must have somehow damaged both motherboards, somehow...
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June 13, 2014 8:11:53 AM

Take out the components and try to power the components on a non conductive/ static free surface with only one stick of ram. also leave the motherboard unplugged for a while before powering it on. Maybe the processor and mother board aren't compatible ( i know you said they are)
please state the exact MOTHERBOARD and processor you are using.
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June 13, 2014 8:24:00 AM

Its an LGA 775 Motherboard and was going to swap the pentium dual core 2.8ghz, with a pentium dual core 3.4 ghz.

After i tried swapping the processor, I put the old processor back in, and it wont boot.

I took both processors out and tried them in a third machine, and both worked fine.

I may not have left the battery out long enough when i tried a bios reset, but i shouldnt have needed to reset it since i only swapped processors.
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June 13, 2014 8:41:06 AM

try my original suggestion. Take everything out of the motherboard and try using a test bench. This has been the solution for me before. It eliminates the possibility of the case not grounding the motherboard correctly.
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June 13, 2014 8:45:20 AM

Ok I didnt try powering things up without them in the case so i will give that a go, thanks
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Best solution

June 13, 2014 8:55:31 AM

1 stick of ram. only no extra things connected just what you need. if the motherboard has on board video use that not your video card. i guess if that docent work try different stick of ram. And if it still docent work you might need a new motherboard
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June 13, 2014 9:22:01 AM

It should at least do something if I plug the psu into the mobo, and use the on-board graphics. the bios should at least fire up right?
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June 13, 2014 12:07:42 PM

some motherboards need a processor and a ram in order to do something. make sure you do have those two things
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June 13, 2014 1:50:50 PM

i have ruled out everything other than the mobo it could be... unfortunately I dont know how I ruined them I was careful. Thanks for the help
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