Since you try it in a different motherboard go on eBay and buy a super cheap LGA 1155 CPU. Intel Pentium SR059 G640 2.8GHz on ebay is $7 with free shipping.
Ok, start by removing your Graphics Card (if your motherboard has onboard graphics, use that. If not, than just use the LEDs on your motherboard. Your keyboard works too. If you can cycle the Caps Lock and Num Lock indicators, then your computer has booted up).If you have another CPU, try that in the same system. Do the same with the PSU, if possible.If neither of those work (or you can't), than remove all but one of the RAM cards and try that in various slots (do this with multiple RAM cards).If the computer boots during any of these steps, then reassemble it (one component at a time) until it stops working again. Than you have your faulty component.Edit: I somehow forgot you mentioned you had another computer with the same CPU Socket? Something you could also try then is to simply transfer parts from the faulty system to the other one (one at a time). If the other computer stops working at any point, then you have your faulty component.Also, if the other computer does not stop working no matter what your swap in, than it's likely your main computer's motherboard that is faulty.
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