My iMac wont start and is showing just a http://chris.pirillo.com/wp-content/uploads/2009/03/3331459927_56be5b67cb.jpg sign. I've ran the hardware test, that is ok. Recovery partition works (Lion). I couldn't clone the hdd to an external as it failed and I tried to repair disk using disk util and said failed. This is pointing to a HDD failure right? I just wonder why the recovery partition works. If so, iMac 24" has a 3.5" sata 2 HDD? Since sata 2 is hard to come by these days, would a sata 3 HDD work, any branding? Thanks a lot!