Maybe it is the ram. I tried OC'ing a little to see if it would boot at 9x296. It wouldn't boot at default settings after just changing the fsb but it did boot at that speed when I set the ram to 1:1 ddr-592. Also Memtest didn't get any errors after 6 hours last night. Does suggest that there is a memory problem?
As was mentioned above you may need to set the voltage of your memory to the proper level.
Bookmarks