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Then how do you fix the power supply?
You probably can't, unless you're willing to either modify the case or have the power supply hanging out of your computer. Dell usually uses what are called Small Form Factor supplies. These are much smaller than conventional, ATX supplies, and AFAIK are available in a maximum power output of 300 watts. (I do know some very questionable places that supposedly sell higher-rated ones, but I don't trust them.) If yours is a 300W, you might even be able to put a GT430 card in your computer, but that's about it.
How do you check?