if it was in pieces i have to agree with techknight, probably been heatgunned or oven baked. If it has bee you probably have a dead chip.

I once when through a pile of about 30 dead xbox boards i had, all had probably been heatgunned, pulled out 15 with exploitable kernels and pulled the CPU and GPU off each. Out of that lot i got about 6 or 7 good GPU's and 4 or 5 good CPU's (which is pretty impressive, xbox CPU's tend to be harder to break than the GPU's)