I just recently built me a new desktop and for the first couple of days upon installing win7 64bit, it was fine. Did a 15hr system test and all went fine. Had it running for a good 4-8 hours a day. But then 2 days ago I've been getting random shutdowns out of nowhere. Shutdowns can occur right after boot up or maybe 15min after while I'm watching a movie, or even 2hours later while working. I've installed the latest BIOS for my mobo. I've installed Rivatuner and tweeked my gpu fan speed up. (Now idles @ 45-48'C) I don't think it's a heat problem cause I have 5 fans (3 intake and 2 exhaust). Here are my pc specs: amd phenom II x2 555 BE (Idles @ 30'C) ecs a790gxm-ad3 BE inno3d gts 250 1gb 256bit (Idles @ 45-48'C) 4x 2gb kingston ram liteon 24x dvdrw samsung 1tb hd windows7 64bit Home premium 600w thermaltake PSU The system is not connected to the internet btw. Anything else I'm missing? BTW, problem started when I attempted to install Britannica encyclopedia, 1st shutdown occurred. Tried to install it again and I failed because of installer problems, but then again maybe it was just me and my ignorance. Skipped Britannica and installed wings3d. Was successful, then 3-5mins later the 2nd shutdown occurred. Installed Maya9 and 5-8mins later, 3rd shutdown occurred. It's been going on for about 3 days now. Random shutdowns everywhere. Can I get some help? *Edited* It's been going on for 5 now to be exact according to Event Viewer.