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Re: XPS 420 CPU Switched Off by Itself.

try removing all the RAM, the m/b should make continuos or 4 error beeps, indicating missing RAM, this would tell me the m/b is good if the PC stays on, the best troubleshooting method is to replace parts like, video card, RAM, PSU, m/b.  I am not sure about recommending a new PSU, maybe someone knows a local computer shop or school with an IT department, they will have an older test PSU

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