Computer boots up entirely only every other time.

when i boot my computer, one time it'll work once i choose my OS. the next time, it wont work; just the post beep then a black screen that loses signal. can anyone help out?
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  1. Electronics working only every other time is not an uncommon occurrence. I have a Samsung TV that only starts every second time I press the on button.

    This kind of thing is typically, but not always, caused by a short connection. This could be due to a component not being seated properly, or having dirt on the connecting pins or it could be caused by something less easily remedied such as a damaged motherboard or PSU component.
  2. alright. thank you. ill try my best to figure everything out.
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