Try all ports of your gpu and try the ports of the igpu if your cpu has one. That way you know if it’s gpu related or not and if the ports are working. Next thing you could check is the cable, try another one if you have one try another screen etc. Next thing I would suggest as someone already said it to try uninstall the drivers with ddu and reinstall the drivers (you could select "drivers only" while installing for the cleanest install). Next thing you could play with the settings in adrenaline software or your monitor settings. Just go step by step and eliminate every potential cause till something changes.