Question My PC starts up but then immediately shuts down on loop

May 2, 2020
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I've been cleaning my pc today and took out the power supply, gpu and fans to clean the dust. After putting it all back together correctly, my pc has now started to boot up but then after 1 to 2 seconds later shut down, then does this in a loop. I expect its something to do with the limited power to the motherboard but my powersupply is 230 volts.