You can try using the 20 pin psu to test the motherboard. The 20 pin connector will fit in a 24pin connection.
So I took everything out of the case. I tried powering up with just the CPU and Heatsink installed on a cardboard box and it still didn't power up. Nothing at all even though the green LED light on the motherboard is still glowing. What can I do now ?
Anyone ? Desperately need help.
Errm i think u gotta test it with the both rams in first and if it does not work take one out and try again....
Your problem seems to be exactly same as mine few weeks ago.... I really would RMA your board OR check PSU first to make sure...
The faulty board i had was GA Z77 UD3H and i was using it for a good 2 month before it went bad....