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RE: pc on, but monitor button just flashing
The connector of your monitor cable is loose? Simple re-attach the cable? You can usually attach it firmly to the video port (VGA) at the back of your PC by using the 2 screws on the monitor cable connector. If there is more than 1 video port on the back of your PC which the monitor connector fits on, make sure you use the right one. Although you can safely try them all and see which one works, just don't breaks any pins by forcing it.
If it's the video card itself that's loose you'll have to open up the PC case and do like Danny said.
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