I would go over all connections carefully. Also check the mounting screws to be sure it's in the right holes. Hope it's nothing more than that. Good luck.
So I replacement my case yesterday. I know that Mobo is getting power as the LEDs on the front case are on/working but when I press the power button nothing happens. No fans start or anything. Already tried resetting the CMOS but again nothing.
No idea what to do.