No. of Recommendations: 2
Sorry, I saw that you had said it worked in firewire target mode, but I had missed the "moving firewire symbol" part.

If I try to boot it up all the way to Mac OS X it goes into white screen mode and just sits.

You've probably tried it, but if not you should try booting from an install DVD. If that works, try running Disk Utility while booted like that. That will let it more thoroughly check the internal HD that you normally boot from.

My 20" iMac did a similar thing, back when I had it with us on a trip to my parents, a few days before taxes were due...which I was still working on. After backing up anything important (luckily I brought a lot of things with me since I was planning on fixing both my parents tower and a friend's 13" MBP), I reinstalled the OS via DVD, and then installed all the updates.

It might not be your same problem, but it was similar enough. If you feel like putting a little more time into that machine, I'd suggest booting off the DVD, running disk utility, and then if everything is backed up that you want, try reinstalling.

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