My 2007 iMac (running Snow Leopard) will not boot inito OS X. The internal drive doesn't show as mounted in Disk Utility (via install disc 1). I've tried to do a Safe Boot by holding shift and took a photo of what appeared on screen. Does this give you any indication of the issue and how to resolve it. I was advised to run Apple Hardware Test via install disc 2, however the iMac keeps ejecting disc 2. It's not a massive issue as I've got a new iMac on order and I have a Time Machine backup on an external drive. If I can get into the 2007 iMac I can check that my backup is the latest. Thanks in advance.