My Studio XPS 435mt did that about a year after I bought it, just out of reach of the warranty. 2010. After a few black screens, it went totally dead. No board lights. No power light on psu. Turned out to be the psu. Found a psu calculating tool on the Newegg site which finds the right psu for your hardware. Looked up a good psu (silver rated) and popped it in. Had no problems since. Google it. I can't tell you name brands because it's Dells' site. You'll find it. I know this is an old conversation, but I'd thought I'd leave an answer for someone who might need it. Hope it helps.
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