OKay here goes... my problems started about 2 weeks ago with my PC freezing during startup, mostly at the Windows XP loading screen, when it would get past that, it would lock up at the Identities screen. I tried redoing my hardware (Nvidia 7600GS video card, and Seagate SATA HDD are both fairly new) to no avail. RAM checked out fine, so i went to repair install windows. Froze up twice during the setup (89 and 59% respectively) Safe mode wouldnt load either (would freeze on drivers.mup always, then on the very first driver to load after the failed repair installs... So i take the PC in to a repair shop to get looked at. At fisrt they think its the RAM, then the power supply. But tests show them its the mobo that isnt firing up, so now im at my dilemma. My old mobo is a ASUS P4S800, socket 478. The only 478 readily available to me and close to my current specs is a Biostar (P4M80-M4). Will this change of brand (mobo/BIOS/chipset) affect whats already on my Primary HDD? Will i get conflicts? Also when last I went to repair install Windows, rather than showing me which Windows I wanted to repair, it showed me ALL of my partitions, and when I went to C: to install, it told me Im about to install an OS on a partition that already has an OS, and basically that ISNT good....Im all for doing it, but Id lose everything in my shared documents wouldnt I?.....what about my other partitions?...wouls the data stay intact if I went ahead with the reinstall? Please help, any advice is appreciated as I am lost without my PC....thank you, and I welcome any questions about things I was unclear about!