Hey all, I found this forum through searching at yahoo when i typed in "Random computer restart" and this was one of the first hits, however... the thread really didnt help me answer my question. At random times, from, doing virus scans, web surfing, watching media, or playing games my computer randomly restarts on me, screen goes black no prompts or anything and restarts my computer normally as if it was off and i turned it on, when it gets back to windows.. no messages of errors or anything. The ironic thing is i just built a new computer and i am having the same exact problem, the only shared parts of old and new computers are the Cd-Rom, Floppy (yes i still have one), and case. otherwise nothing is the same. My new comp specs are: evga 680i mobo (used to have Nforce 2) intel core 2 duo 1.86 ghz (used to have AMD2400+ evga nvidia 8800 gts 320 mb pcix 16x(used to have radeon 9800 pro 128 meg agp) 2 gigs of OCX DDR2 800mhz ram (used to have pc3200 1 gig) 250 GB SATA (old one was IDE 80 gig) 600 watt psu, cooler master (my old one was a 350W) I thought that the power coming into my corner of the room was initially the problem. so i bought a UPS backup. i bought an APC 900VA 540 Watt battery backup that has AVR Tech (which automatically goes to the UPS if the power isnt at an appropriate voltage). I did not put in my old hard drive although i did put on some of the old files. after scanning pcdoctor and norton to make sure they were ok files and not corrupted..although maybe they missed something. I have since put on norton and scanned updated. and updated all my drivers and xp still get the same problem. I am very baffled since it is happening with 2 different computer set ups. thats why i thought it was external power but maybe i'm just unlucky? Thanks for your help guys anything you can do would be greatly appreciated! UbiquitousMortal ... i was just thinking maybe its the connector from my computer restart switch to my motherboard..that wire. does that sound feasible enough to disconnect it and see if the problem goes away... also it seems to happen a lot more when i'm watchin vids on my computer. but i havent kept track of what i was doing since there is no apparent consistency.