Hi, My 24" iMac (3.06, 4gb, 8800GS) started having weird graphical issues in OSX which based on online research seems to suggest possible graphics card issue. After trying ram sticks individual to check them (no change) I was planning to use a time machine backup, however it has now seemingly for no reason presented another issue. Reguardless if I boot from hard drive, original 10.5 disk, snow lepoard or the snow lepard disk from my newer 27" iMac after a minute or so of bootup I get the screen go grey from top to bottom and am told to reboot. This also occurs using safe mode, and booting with option to select boot disk does not work (windows 7 bootcamp also won't load and just stays black). I can get into single user mode, however I've not been able to use diskutil to erase my disk. All I want to do is try and time machine restore and hope the graphical glitches were just a software issue. fsck normally finds an error on first run and not second, but does not change anything when rebooting. I'm hoping discutil will let me format the hard drive and then it might magically be able to boot from an OSX DVD. ANy suggestions on how to get disc util to work? I'm getting management framework not installed errors and I've tried: mount -uw / /usr/libexec/register_mach_bootstrap_servers /etc/mach_init.d SystemStarter start Disks However this was found online for OSX 10.3 and I just get folder errors on the /usr/libexec.... part. Any help would be gratefully appreciated. Oh, I can also get into hardware diagnostics on original DVD which shows no faults on short or long test.