You will need to open it up and get the number off the front of the voltage regulator. The number usually starts with an STK and is attached to a heat sink. The system I am presently repairing has an STK470-050A which costs $13.82 + shipping. This may not be the part for your system but it will give you a ball park figure of how much yours will cost http://www.wehaveparts.com/

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