1st time builder. Everything was running fine so I thought I'd try the autotune function in "Intel Extreme Tuning Tool". I was using the "stay within acceptable parameters". Also using the base BIOS. I got a screen that when trying to boot said something like "unsuccessful post attempt", so I went into BIOS and used the set defaults (F9). Everything worked again. Came back later to a black screen. When I tried to restart fans would come on, but black screen and system would power off in about 20 seconds. Had an "E6" on the post board. I saw some similar threads and used the Intel site suggestions. So that was to remove the battery to reset the CMOS. Left it out an 1.5 hours. Now when I try to power on fans go for 1sec and stop. Have a red LED light at bottom of board. No clue what to try next. Have tried taking out all mem sticks but one as well as one video card, but still nothing.
MB: Intel DZ68BC
Proc: Intel i5-2500
VC: EVGA Geforce GTX 560 x2
Not sure what other info would be needed.
Did you try to "back to bios default" button on the back of the board?