This might sound like a silly question, but is there such a thing as check-ups for a Mac computer? I've had my first generation Dual 2.0Ghz Mac G5 for several years now and although it runs great, I think it doesn't perform quite like it did when it was newer (but thats true with everything). Taking off the side panel, there is quite a bit of dust in the computer, and i'm afraid if i start messing around inside I could damage it. I also wanted to add a gigabyte or memory. So could I bring it in somewhere to have it cleaned and run through the software and hardware to make sure everything is up to snuff? Or is that ridiculous...?