I need to revive this old thread since I have the same problem.
ECS AMD690GM-M2 motherboard and a Phenom 9550 CPU... supposedly this is a supported (and recommended) CPU for this board, according to this page:
However when I install the processor, I get only a black screen upon turning on the system. Fans are on, but no video, no beep, no POST.
The processor is tested to work fine in another board, and the motherboard works fine with an Athlon X2 processor. I'm using the latest available BIOS for the motherboard.
Could you please help to figure out how to make this processor work? What can be missing, what should I try to fix the issue?