Originally Posted by
ZERO
You need to verify the following in order:
-Verify power, see that the PSU does work by connecting it to another computer or a PSU tester.
-Verify power to the motherboard before power up. A status LED or some other indicator should activate showing power is flowing to the Motherboard.
-Connect only the CPU RAM and GPU to the motherboard and attempt to boot. The more stuff you got the harder to debug. Your goal is to just get the thing to post you can connect hard drives etc later. (this should be ideally done on a bench all you need is the box the motherboard came in)
-Once you get it to post on a box try again once mounted inside your case. If you can not get it to post the cause is a short resulting from case installation.
If you can not get it to post on a cardboard box then the motherboard should be producing an error code. Reference the manual to determine how to find and read the error code, once you have the error code you can proceed.
Also if you have not be sure to clear the CMOS by removing the battery.