Hello, I have an Asus M4A78T-E mobo, and I had installed the cpu in the mobo with DDR3-1066 RAM. My problem is that I have double checked all the cables, made sure they are all plugged in, and even checked the heatsink and cpu over and over again. It posted ONCE, and then I went into the bios, changed the boot priority to boot to my primary hard drive, and then saved and exited. My problem happens after I have done this, no video, no post, theres nothing, absolutely nothing. Everything works, video card kicks on, fans spin, cd burner turns on, hard drives kick on, but no post or video. I have checked my RAM speed, and it says that the Phenom 2 x4 955 supports UP TO 1333, which I am guessing it supports lower speed RAM under 1333. I checked Asus and it says that the 955 is supported, but only after the 1001 update for the motherboard. I have come to conclude that it is either my RAM speed, the cpu itself, or I need to reset the CMOS and flash the bios to update and get support for my cpu. Any help on this topic would be appreciated, I really don't want to send it back to newegg for a refund. Please help.