Fix: CPU is unworkable or has been changed.

Today I fixed a friends computer that was suddenly displaying the message “CPU is unworkable or has been changed” at boot time and performing very slowly. After running one of my diagnostic tools I found that the CPU, an AMD athon 2800+ was running at a speed of 1.25Ghz. The processor should normally run at just over 2.00Ghz.

The solution was to enter the BIOS and reset the front side bus number. Which for some reason was suddenly 100 with a multiplier of 12.5 (100 X 12.5 = 12500). When I changed the FSB to 166 it starting working as normal again (166 X 12.5 = 2075).

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