| Yes, opening the Mac will depend on whether you have a Blue & White, a Beige Tower (high), a Beige Desktop (long and flatter), or an iMac (all-in-onein translucent colors). (Or the unusual All-in-one Beige.)
Cleaning it will be nice, but if the drive is not working, there is probably nothing cleaning it will do. Good news is you can order a new(er) one online. When you open the case and find the drive, it should tell you which kind you have. Replacing it is mostly a matter of unplugging the cable and plugging in the new one.
By the way, you aren't running OS X, are you? |