My boss brought me his daughters MacBook running 10.6.5 with the following problem. When she logs in, the account takes a long time to login and as soon as it is finished it logs her out and sends her back to the login screen.
I tested and found the same problem. Once the dock and Finder appear, you have like 5 seconds before it kicks you right out.
A few things I did notice:
When the desktop comes up, it appears to be an active desktop with changing pictures;
When the Dock does come up, there are lots of Question Mark icons, one I was able to tell was the System Preferences - but that could just be because it hasn't linked back in the time before it kicks you out.
Other than that, I just cannot stay in there long enough to do or check anything. A few things that I did try doing to troubleshoot:
I tried booting from an install disk and running Disk Repair and Permission repair, to no avail;
I tried resetting the NVRAM and PRAM - it did nothing;
I tried SAFE BOOT - same thing happened...
If this were any other computer, I would boot in Target Disk mode and backup everything and try to re-install OS X, but since it is a MacBook, there is no FW port...
Anyone know what I can try next or have any ideas or possible solutons?