I don't know what else to do. This is my second processor in box that hasn't worked. The first was RMA'd back to AMD and was confirmed bad by AMD.
Processor: AMD Phenom II X2 HDZ550WFGIBOX
Motherboard: Gigabyte MA790X-UD4P
Video Card: ATI Sapphire Radeon HD4870
Memory: Crucial Ballistics 4 x 1Gb of DDR 800Mhz.
Power Supply: 850W
Troubleshooting: Replaced motherboard and verified that video card, memory, and DVD-ROM and power supply all work. Replaced Processor with replacement from AMD after first processor was verified as bad. Computer posted once and asked for a disk. Once disk was inserted, computer powered off. Computer will not post after that once. Fans work. Lights work.
If you have any ideas, I would love to hear them!