My computer beeps once and restarts?

When i start my PC it beeps and then restarts, i can't even get to BIOS because nothing shows up on my monitor. Also i know this can happen if you mess with the BIOS, but i have not messed with the BIOS at all. If i open my PC and unplug everything and re-plug it all (all cords and memory / video card)
it MIGHT work, but then the next day it's back to being broken with the beeping and then restarting.
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    Start with trying another video card or the mb video chipset on next failure.
    If still won't post right try one dimm at a time to rule out ram. If not ram issue it could be a failing power supply.
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