Horrible monitor quality all of a sudden

I have this 1080p monitor I use, connected with mini display port to HDMI and it was working great, but the colours were slitly less vivid, but nothing to worry about. I decided to change them, went to the display pane and it was 1080p with 60 hertz for the refresh rate (NTSC). Ok, great. I clicked on the refresh rate to see if there was another one, there was only PAL so I clicked back on the NTSC option. After that, quality went from Full HD to nothing. Any tips on what can I do?

Reset the PRAM:
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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