The reason I asked about the motherboard jumper is your weird issues. If you did it in BIOS and there really is a mobo jumper, then you're basically overclocking your processor to its normal speed. OC'ing can cause serious power issues and the scrambling you're describing. If you have a Thoroughbred B Core 1800+, then it's very possible your processor could OC that much. Flipping the jumper on the motherboard would make BIOS recognize your processor as an 1800+ by default instead of having to change the frequencies.
How hot is your room? Like I said, AMD does say their processors are OK until 90 celsius, but over 60 is usually avoided. Are you sure the thermal paste is spread good on your processor and the heatsink is installed correctly?
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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