Hi, Sorry, you probably get a lot of these posts. I have read various things on websites but unfortunately, none of them have worked. The most common suggestion was resetting the iMac and then holding down cmd and R, but that hasn't worked. Basically, my poor little iMac has gotten incredibly slow after updating to 10.8.4. I have no idea where the original disc is, but I do have my snow leopard disc. Putting that in didn't work, though. I just want to completely wipe my iMac and start again. It's early 2009 if that helps. I'd appreciate any help anyone could give me. Cheers.