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there is also a tool that plugs into Etho(sometimes)/Parallel/Serial and (sometimes) USB, that when plugged in, will bypass the boot drive, and run a hardware check on everything from Northbridge to southbridge. I have one fot Parallel and Serial. Another way to test it, is to use a Volt Meter to see if there is any power goin through it. Check the voltages, mebbe its grounding to case or bad solder where it mounts to mobo. Just a thought ........