I'm sure you could test it first. Not done it before but maybe remove the ps and power it up, use a multimeter, one lead on the case, the other on the ground plug of the other outlet its plugged into? If you read voltage, replace. But if it were me, I'd just replace it. Doesnt make sense the short would be anywhere else. The motherboard or any components would either fry or you'd definitely have problems while its running.
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