Re: computer fans turn on and off every two seconds
Okay, unplug the PSU from everything, take a paperclip, straighten it, then bend in half. Use the paperclip to jump green to black on the psu (in the 20 pin ATX plug), and leave it there. If the PSU shuts off after 2 seconds, its dead. If it stays going, its the motherboard.
Forgot to ask, what PSU is this?
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