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We had the same thing happen to one of our boxes. It ended up being the power supply. It wasn't powerful enough for the processor. This was our designers comp. When he would start up PHotoshop and several other apps the computer would start making a high pitch beeping noise. If your running dual and/or a new high speed processor this may be causing it. Took weeks of headaches. Finally the company that built the box realized that the power supply wattage was too low for the system and the dual vid card that we were running on it. The power supply would heat up and set off an alarm. Maybe this will help. Good Luck.
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