Did you plug everything back to the new power supply?? is your monitor data cable connected properly??
please check everything is properly seated (don't assume... spend 5 minutes checking everything again) and make sure you GROUND YOURSELF by at least touching the power supply first before touching any component inside your pc.. don't forget to unplug the power cord from the power outlet!
some motherboard may have not only 1 but to power connectors, check your motherboard manual to ensure you're plugging everything that you need to plug (no more or less.. just about everything that needs to be plugged.. depending your motherboard and cpu power requirements.
check your memory is seated properly.
is your power supply of the same wattage as the previous one or larger? (if it's larger that's fine.. you gotta make sure you do have sufficient power)
check your monitor's data cable is actually working by plugging it into a known good tower.
check your video adapter is working by trying a known good monitor and plugging it into the your pc.
if possible try installing another video card and testing with a known good monitor.. if it works you may have fried your video controller on the mother board/video board you had/have on your pc.
please post what troubleshooting steps have been tried.
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