I've done everything I can think of...I've put in the memory, CPU, video card, mounted the mobo on my case's mounting board, powered up, and I get nothing. My monitor displays "no signal input", and I don't even get a single beep. I've gotten my computer to post 2 times out of about 500 tries, and then afterwards, I get nothing again. I've reseated everything more than once. I'm clueless what to do. Any ideas?