This has suddently happened – when I press the power switch, the PC starts, fans come on, first screen appears – then after a few seconds there is a click and the power goes off. A moment later there is another click and the startup begins again; this happens over and over until I disconnect the power supply (the duration being anything from 1 to 5 or 6 seconds). Could this be the power switch or the psu? Would appreciate any help
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This could be a bad power supply, overheating hardware, or a short in a circuit almost anywhere. If you have a power supply tester i would start with checking that.
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