CPU A & B overheat
Someone brought in that MP 2,1(1186) ,2007; S/N:157192LMUPZ, that was shutting down randomly. The diagnose LEDs on the logic board say: CPU A&B overheat.
I took it apart, released it from that disgusting melange of nicotine and dust, gave it a fair layer of thermal compound.
Now the thing just reboots randomly, even in idle and the LEDs still say : overheat, although all fans are working.
Note: He bought it ' hacked '; its running Mavericks on a 256 GB SSD, with a ATI Radeon HD 8770 and it will not boot externally from either SL oder Lion, doesn't even accept target mode.
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