Hello all,

I purchased an ASRock M3A770DE AM3 AMD 770 ATX, AMD Phenom II X4 955 Black Edition Socket AM3, HIS Radeon HD 4850 and 2x1GB DDR3 1333 RAM.
After installing everything the computer won't power up. If I disconnect the ATX 12V power connector (4 pins) and power up all the fans come on as well as power and LEDs but after that nothing happens.... no BIOS screen.

Any ideas?

Thanks.