Early 08 dual 2.8 GHz Quad core, 10 GB RAM, ATI HD 5770 (and HD 2600), 2-2TB HD. Having sporadic sudden loss of power. It's like you pulled the power plug (not a reset but completely off). It started a couple of weeks ago and can happen from once ever couple of days to several times in an hour. I can push the power button and it will restart. Have been trouble shooting but I'm just barely above shooting in the dark. 1) Changed video card 2) Removed extra HD (so I just have boot & TM) 3) vacuumed cleaned removed RAM and checked by eye, checked all fans 4) Increased fan speeds and carefully watching temps (using iStat). 5) Bypassed UPS, replaced Power Cord, DVI and DisplayPort cables At wits end and hope someone can look t my logs and tell me what looks to be the problem. Here is the time logs before the last power off and expanded with full info for the last entry.