I built my system in 2001 and have had the same system drive all this time. In the last few months my HD has not been booting when I start the CPU. It will say "system boot disk error, please insert system disk" in DOS. I thought it was maybe my mobo, but when I go into my bios it does regonize my newer 320 gb hd that I keep all my media on. Bios does not regonize my older system drive. For the last few months it would work if I leave the whole computer off for a couple days and then turn it on, but its been 5 days now and the computer will not regonize the old HD or boot from it. I just bought a new 120gb drive from newegg to see if n fact it was the drive. I will get it this friday. Is this something that is usuall for an old HD??? It can't be my mobo if it regonizes my other HD right? I have tried exchanging ide cables and I get the same results....newer HD gets reconized, old one doesn't... Please help