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Replace the whole PSU; don't risk it taking other components with it when it fails. Ideally you want a good brand, like Antec. Quality matters more than total listed wattage. Installing a PSU is very easy, just a few screws attach it to the case. But you should first make sure a standard PSU will fit that Dell case. Unfortunately these mass-manufacturers will sometimes use non-conforming proprietary components to discourage you from doing any repairs or upgrades yourself.
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