I currently own a Dell Dimension 4600C. I left my house with it turned on like any normal day, and when I came back I noticed that the hard drive was making a pretty loud sound. There wasn't anything on the computer monitor and after hitting a few buttons on the keyboard, I powered the computer off. I then powered the computer back on and got the message that the primary disk could not be found. It didn't recognize the hard drive at all in the bios. I also noticed that the hard drive was just making a clicking sound (it didn't sound like it was spinning or anything). I took the hard drive (80GB Western Digital Caviar WD800) out of the Dell and put it in an HP Pavillion as a slave drive. However, when the HP powered on, it said "operating system could not be found." When the Western Digital is disconnected, the HP works fine and boots normally. I have read reviews on the WD and haven't seen too many good things. Many people have had it fail on them..I do have SOME data backed up, but not ALL and much of it is extremely important. Does anyone have any suggestions before shipping it off somewhere and spending TONS of money? Thanks