So, I have a 2008 iMac (8800GS) (purchased in 2010), and it was working totally fine until I went to turn it on this morning. It started beeping. I pulled the power plug, and all was fine again but I just want to know why it does this, because it's happened before. The RAM is fine. VIDEO: http://www.youtube.com/watch?v=BbCAMFkyixM I've had so many replacements on this machine too, it's starting to get annoying: 1 hard drive replacement (was failing) Another hard drive replacement (was failing again) 1 graphics card replacement logic board replacement It's starting to get annoying to have to lug this thing up and down to the Apple store. What is this sound?