My computer won't recognize my monitor after unhooking for a couple of hours

This will sound strange. I have a powerspec computer and sceptre monitor. I unhooked everything to move it, and now the computer will not recognize the monitor. - light on the monitor flashes but not display - computer is clearly doing start up. Everything is hooked up right. I remember when we originally hooked it up we had the same problem, and the store told us to do something that worked. I can't remember what that was???? Any help?
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More about computer recognize monitor unhooking couple hours
  1. is it hooked to an integrated video port, or a discrete graphics card?
    More importantly, does the PC have both or just one?
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