Windows 7 - Phenom X4 955 help

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.

Reset the cmos. If that doesn't fix it, you'll have to check the hardware one at a time. All three of the main culprits can cause the MB to fail to post. To check memory, remove each stick one by one and try booting with each one missing. To test the graphics card, you can remove it and boot and the MB should boot to a POST fault code, two longs beeps iirc. The processor though will need a replacement to test, unfortunately.

What Bios are you currently running. If it is not the newest then flash to the newest. Also only run one dimm in slot 2 during install. then after full install of OS, shut down , insert other dimms, go into BIOS and ensure that the settings for your memory is correct. Run unganged and 2T (even with initial install)

If your motherboard is not the newest bios revision you may need to "borrow" another cpu from a friend to use so you can boot the pc up and install the bios update. I know this is a pain, but its the only way.

If it has already booted I doubt that it requires a BIOS update, I have had a problem like this once with an Asus M3 board it failed to come out of the BIOS properly and exhibited the symptoms that you describe. The only option was to RMA the board.

B4 you do that though I suggest that you remove all hardware from the MB. Replace only the bare minimum then try again to see if it will boot

I hope this helps

Pooch