pc turns on when disconnected

Forum discussion tagged with pc turns on when disconnected.
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    [SOLVED] PC powers on for a sec when PSU is off (after I press the power button) (residual charge)

    When I turn off the PSU and then I press the power button, the PC turns on for a second. I had built my first PC, and it posted successfully the first time but when I moved to the other room it didn't post, so I looked for a solution on the internet and I found one: basically turn off the PSU...