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very high CPU usage due to system interrupts

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Nov 15, 2010
Palm Harbor
the computer i built for my mom from spare old parts has a pretty high CPU usage being caused by system interrupts. up to 20% of the CPU is being used by it. its a Core 2 Quad 2.4ghz OC to 3.0ghz. something is really adding a load. whats the best approach for finding and fixing the issue?