I have a P4 3.0ghz Intel 865gbf m/b with 1gig ram. hdds installed 1. 160GB Sata Hdd 2. 40 and 20 GB Pata Optical drives: 1. CD writer 2. DVD Writer. The machine worked for couple of days till it started hanging at bios screen. On proper fault elimination i removed my 40 gb hdd. The entire set up worked fine for next 4 months (never had to re - install windows). While few weeks back it started to slow and ultimately i had to remove this time my 20 gb. I added another hdd this time 250GB Sata HDD (7200.9). The installation was ok and fine. I was able to transfer tons of data from 160 to 250 without any problem. Next day I decided to transfer remaining data but it won't. everytime it started to copy from my 160 gb to 250 the system hanged and the only thing i had to do was reboot. couple of reboot and my 160 gb became use less. Hell that wasn't enough even my 250 too started giving problems. Somehow i got my 160 GB back to working but now my system won't even detect it. now where is the problem, my mobo, proc, ram. or the setup that i had.