I was using one of my hard disk until yesterday afternoon and decided to take a break, in the evening I installed my newly bought graphics card and booted up the pc, initially my 2nd hard disk and my DVD Rom did not show up, after trying all available combinations, I got the DVD writer to work. I tried connecting the hard disk to another computer but no avail. There appears no physical damage on the hard disk and it was recently exchanged by the company as it had crashed in its warranty period. The hard disk appears to be running and the BIOS is not detecting it... Help?!!