I had this happen 3 times to me- my story: used silver pen for circuit boards to unlock 1600XP, it worked for approximately a week (GA-7VRXP board) at 12.5 instead of its native 10.5 multiplier. Now, GA-7VRXP is awesome, however multiplier is to be set old way - through dip switches. After a week, the CPU wont boot. Nothing helps- had to bring dip switches to the default settings, it boot the CPU at native 10.5 multiplier. Got the CPU oput, cleaned , re-applied the paint. Worked at 12.5 for antoher week, died again, procedure repeated. Dies 3rd time, could be that the circuit board silver pain is not that durable as the stuff other people using, at the working temps of CPU it is deteriorating contact or something. Got the CPU out, cut the L4 bridges and applied the lead pencil for the semi-permanent 12.5 selection (following interactive painting guide). Computer worked fine for almost a week now, hopefully will stay that way. Running 12.5x140 now.
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