So it worked after the repair and started to show this behaviour later on? Then it sounds very much like a HW problem. On the other hand, this is a BPPC and it already has the ppc started from boot (through ppc.library in its firmware->PUP). So is the problem you have with PUP or WOS software?
The first thought I had was why would it boot correctly if the PPC does not work, doesn't he have WarpDT for the PPC installed :-P
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