Hello. A few days ego I've made some changes to my computer (bought PSU, new hard drive Seagate 7200.10 320GB SATA, sound card, done some things with chassis) and I started to have some problems with system. Computer started rebooting itself, I couldn't install downloaded stuff... I use my old HDD - ST3120026AS Barracuda 7200.7 SATA 120GB for downloading and swap file. I have noticed that on this HDD sometimes big files are different than source when coppied. Checksums are wrong, some bytes are changed. When I just copy ~1GB file I get a bad checksum for sure. There is no such a problem on my new disk! I hope I didn't damage it physically while modding of my computer. Do you have any idea what could it be, how to diagnose/repair it? My system: WinXP Prof SP2, Abit nf7-s, Athlon XP-M 2500+, 2x512MB RAM Thanks in advance!