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Re: XPS 420 CPU Switched Off by Itself.

back in my PC technician days, it was rare for a faulty PSU, the XPS Is probably from late 2007, check the m/b capacitors are flat and not crowned, try "F2" for setup and set BIOS to "factory default" and clear log files, verify nothing is grounding out or shorting out the m/b, example a bad USB pins completing a circuit, if a friend can borrow an old good known working PSU to verify its not power, and of course be careful with static electricity & remove the power cord before working inside the PC

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