Intel iMac stuck at blue screen.

I have a 2007 model intel iMac running 10.4.11
Never had any problems until about a week ago, then it just locked up. Nothing was responsive although the mouse was still moving (spinning beach ball). I left it for about an hour or so before concluding it wasn't going to work itself out and held the power button on the back until it turned off. Now whenever I start it up it gets stuck at the blue screen. It goes through the grey screen with the apple then to the blue screen but never brings up the "Mac OS X" loading box. I left it for 30 min and still nothing.
So I started perusing these forums for help and have tried a few things.
First I loaded in the original grey disks and erased the hard drive and reinstalled the system software. This worked and the computer worked for about 2 hours before crashing again and having the same problem. Since then I've tried resetting the PRAM, using disk utility on the grey disks (came up with "invalid volume header").
I've taken it down to the apple support store here where I live and they told me it was a dead logic board. Would I still be able to reload the system software and use the computer without problems for 2+ hours with a dead logic board? Any help would be great, also I'll run vebose mode and post again with what it says.

I would suspect a bad HDD. What is the SMART status reported in Disk Utility when you highlight the drive itself, not the boot volume?
Dah•veed

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wondered if anyone could point me in right direction.
When i boot my imac it gets stuck on the blue screen, if if then press the power up key on side of imac it goes to sleep and when i wake it up (2 secs later) the imac behaves totally normally.
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Message was edited by: macjack

Intel iMac stuck at blue screen.

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