Gigabit booting issue - bad logic board?

in Genius Bar edited January 2014
I have a DP 450 (gigabit) that refuses to boot into OS X at all and will occasionally boot into 9.

About 75% of the time the boot will freeze in the middle of loading 9 and always freezes in X.

I am using 3 known good HD's (with OS's already installed on them) with known good RAM (used under 10.2). These OS's were installed on the HD's in a B&W.

Anyone have any idea what might be causing this problem? I suspect a bad logic board, but I am not a tech.

I do not have the hardware diagnostic CD.
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