Hi. Reading root's excellent Disaster Prevention 101 thread prompted me to give this piece of info which may save a lot of headaches and dollars. Around 6 months ago my PC started rebooting itself for no reason or would freeze. So I took it in and it was the Harddrive going. New harddrive and problem solved. Then a short 5 months later, started rebooting itself again. [No malware, I thoroughly checked] and thought, don't tell me Harddrive again. It would shutdown and reboot straight away so did not notice any unusual activity apart from that. Then couple days later I had turned it off completely, so had to do cold start after a couple of hours off, and I heard a funny noise starting up, so took it in again. Techs heard same noise, instantly turned it off and it was Power Supply Fan bearing going. Replaced the PSU totally, [bigger, better at my insistence] new fan on CPU, new heatsink and they thoroughly tested it for three days. [I insisted on leaving it there] Sandra Burnin, etc. Worked perfectly. No probs whatsoever. As a matter of fact Tech was quite surprised at how fast it ran [I keep it clean]. I took it home, pluged it back together, turned it on [VERY quiet now, lol] and away I went. 2 hours later and about 3 REBOOTS. Darn. Rang the tech, and obviously I knew it was from my end as it had survived for 3 solid days with Burnin running at 95% constantly. So he started going thru different things I had at home. He asked me if I had a Surge Protection Power Board installed. YES. Replace it he said. Why? It's working isn't it. Replace it he said again. Went in bought another one, installed, NO PROBLEMS SINCE. [Did not negate the fact I needed a new PSU/fan, etc.] A 1 off thing? Nope. Just two days ago, a guy at work said to me if I knew any thing about PC's. Why? Well his keeps freezing, on reboot sometimes kept getting "Fatal Error" alerts. Happening every 10-20 minutes. Could not net, email, etc. His wife took it to a guy she *knew* was a computer "expert" and said it was hard drive. $150 later, still froze at home [worked fine at his shop] More RAM. $100 later, still froze. [still working fine at shop] Video Card: $120 later, still froze. [ditto] MotherBoard: $250 later, SAME results all round. I knew where he lived and it was a bit remote with power fluctuations, so asked if he had a Surge Protection Board [smartass I was]. YEP. Told him. Replace it! [lol] He comes to work last night. Walks into room where I am. Yells out: Hey Adrian, you are a ^%#(&^ Genius, LOL. He went and bought a $22 board and PC had not frozen all day. Oh: He rings his missus, abuses her about HER *expert* and the dollars spent, she hangs up on him, he walks out room grinning. [Don't try this at home kids, it may be hazardous to your health]. So maybe those with boards and living in a slightly remote or fluctuating power supply areas, it just MAY be your board.