Hi there. I've got a 2009 24" Core 2 duo iMac. Yesterday it started doing the one beep on start up. I realize that Apple's explanation for this is that the computer detects no ram installed. This obviously isn't the case. I have 4 gigs of ram, which Memtest says is good to go. I've reseated the ram twice and swapped each card's slot, to no avail. The curious thing to me is that this started just after I installed a new Linux partition. This install led to some problems, so I ended up having to wipe the system (i.e. reinstalled OSX on a formatted unpartitioned drive). The beeping literally started right after the Linux install (before the reformat), but I can't for the life of me figure out how the two could be related. Anyone have any bright ideas about why this thing's beeping away at me? Can I stop it? Is my logic board dying? What to do? Edit: I forgot to mention that after the beep, the machine seems to work fine. It takes maybe a teeny bit longer to boot, but it boots and runs. I'm posting from it now.