It needs a new power supply unit (PSU). And, it absolutely won't run without that 4 pin connector. Any standard ATX PSU of at least 250 watts will do. But, Dell usually uses a backward configured power supply so you'll have to purchase theirs. If you have a Dremel with a cut-off wheel, or other means of modifying the case, you can use a standard PSU. If it needs the cut-out, you'll see what I mean when you get the new one in hand.
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