My hdd is a Seagate Barracuda 7200.12 (ST3500418AS 500 GB). I removed my PSU and attached it to my friend's system to test my GPUs. When I went home, I reattached my PSU and plugged everything back in. The boot up was getting slow i.e. stuck in Windows 7 "starting windows" screen, boots up and doesn't do anything and shows a blinking underscore. I decided to let it rest since I don't know what to do. After a day and a half, I started it up again. This time the BIOS startup was also slow. 2-3 restarts later the mobo doesn't even recognize the HDD anymore. I tried using a Win7 Install disc and it doesn't find the drive. I have a spare HDD which is a Seagate Pipeline HD .2 320GB. But I think the spare one is also dead. Both HDD are given by my uncle. Both might be already used since he got them from work. Any help would be appreciated.