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PC won't turn on after crash and shut down

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Hi guys and girls, i hope you can help. My pc wont switch on, i was rendering some images on my gpu and decided to let it cool for a bit so switched to cpu. The pc shut down as soon as i done this and then wouldn't switch back on. The fans and lights come on very briefly but then nothing. So, i have tested the psu and it failed on the sata/molex output, pulled out a new psu and same problem, won't boot. So after removing everything except the cpu 8 pin and mobo 24 pin it did the same, but with just the 24 pin connected i get power to all fans and lights but obviously nothing else as the cpu has no power. I've come to the conclusion that it's either mobo or cpu. Any ideas without having to remove the cpu or board? Hope this is enough info. Cheers
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:welcome: Evorglens

You need to provide information about your computer, is it a custom build or brand name such as Dell or HP, if it is provide the model name or series number (not serial) providing these details will enable others to better assist you.

It is a fair assessment on your behalf that it may be the MB or CPU, possibly both and it may concern the +12V supply/circuit to the CPU itself.
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