I have an intel imac that will not boot osx lion, it just hangs on the grey apple logo and then ends up at a grey screen with nothing but the mouse pointer in the upper left corner.
I've tried everything apple suggests (http://support.apple.com/kb/TS2570) to get rid of the grey screen; even putting back in the original RAM. I did not try the Archive and Install or the Erase and Install installation.
I've also ran AHT several times with no errors reported.
I can boot into recovery mode so I bought an external backup drive and cloned my imac drive using disk utility. Then I tried booting from the external HD with the same grey screen resulting.
Before attempting to archive/erase and install I've read that reinstalling from the recovery partition created by mountain lion/lion could be a solution. Though when I attempt to use the feature my only option is to reinstall Mountain lion, even though I've upgraded to Lion.
I'm concerned if I do this that I'll make the problem worse and be stuck with an older install.
I realize I have a new clone of the drive and another external drive (that was dedicated to Time machine backups) with my last TM backup.
The imac came with Leopard installed. I'm not sure if this is why I can't reinstall Lion and only Mountain Lion from recovery, since I've read that Lion would have had to be specifically installed for it to be available for a recovery install. Terminal tells me that I'm running osx 10.8.2, even though I upgraded to Lion.
Anyway, any and all of your feedback would be much appreciated. I'd like to do as much as I can on my own, to keep the repair cost to a minimum, before bringing it to a licensed repair retailer.