Sounds to me like the someone tried to overclock the processor and didn't change both sets of resistors.
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MacBook Pro, 2.2GHz SR Core 2 Duo, 120GB HD, 2GB RAM,
PowerMac G5, DP 2GHz, 2GB RAM, 1x500GB HD, Sonnet Tempo X4P, 2TB RAID, ATI 9650 256MB.