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PC only runs with cover off?

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Is this an intermittent shut-down or does it shut-down straight away?.
Sometimes there is a small cover switch of which is an alarm, what this small switch does is sound an alarm when the cover is off, so this small switch might be the cause of your problem. Go into your BIOS, press F1, F2, DEL key depending on your setup, and look for something like "side cover alarm" and mark it "disable". Hopefully this should sort it out.