Specs: Asrock N68PV-GS AMD Athlon 64 x2 NVidia Gefore 9400GT Inno 3D 1GB 128-bit 160GB Sata Power Supply : 500watts DVD-RW Edimax Lancard the story of my pc: i bought it more than a year ago. it works fine for the whole year. my graphics card was 8400GT back then but i upgraded it. and it worked fine. then one day, my internet connection was not working. i was using the on-board ethernet/lan port that time. i checked the back of the case and noticed that only the orange light (in the ethernet / lan port) is on. i checked the lan drivers and i found nothing. i tried reinstalling it, then it asks for reboot but no luck. i ask my friend about it (my friend was an owner of an internet shop) and he said buying a lan card would fix the problem and it doesn't cost much too. i bought an edimax lan card, it supports plug and play so there was no problem. then, after a few days, my PC froze! i had to press the restart button coz nothing works, the mouse doesn't move, control-alt-delete isnt working and even the numlock indicator wont turn off (when pressing numlock key of course). i tried "System Restore" even if i didnt installed / downloaded anything for weeks but no luck. i formatted it and installed a fresh copy of XP OS but it even freezes in set-up. i tried and tried until such time it finished the set-up without freezing (after about 3 times). after the set up and reaching the desktop, it froze again. that puts a "virus issue" out of this problem coz a fresh copy of windows XP OS (service pack 2) is installed. i tried removing the lan card and graphics card, leaving me to use the on-board graphics but still the same. it sometimes freezes even before windows start up. it freezes after displaying the logo of Asrock (my mobo), and even when i am in BIOS set-up. i tried searching Google for answers. i found out that it can be my PSU dying. i tried a PSU from other computer but still the same. i tried putting my PSU on other computer and it works fine. i guess software issue, virus issue, hard disk issue (coz there's no BSOD), PSU issue, Graphics Card Issue And Lan Card Issue is out of this. thats is what i have in mind today. please ask any questions needed and i will answer them as soon as i can. advanced thank you to all of you guys.