iMac (Mid 2007) only works in safe mode
Greetings, I have a 20-inch iMac (Mid 2007, MA876LL, 2.0GHz Intel) that I am trying to return to service. The computer seems to work fine in safe mode / after a safe boot. However, if I boot normally it freezes / locks up when the desktop wall paper is displayed and before the login dialog box comes up.
So far I have tried the following steps none of which have helped:
- Repaired the disk permissions
- Applied a fresh disk image to the hard drive (works okay on other iMacs)
- Reset PRAM and NVRAM
- Ran the extended Apple Hardware Test (no faults found)
- Installed and ran AppleJack
- Used remote terminal session to check running processes on 'frozen' computer (as far as I can tell none were stuck, none using too much CPU, none using too much memory)
How reliable is the Apple Hardware Test? Can anyone suggest what to try next or the next diagnostic steps to take? Thank you in anticipation of help!
Mac OS X (10.6.7)