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My photoshop is unusable right now because anytime I try to do anything, the screen blanks out in different places and flashes and doesn't let me use any tools.
First, do you ever use an external monitor on this system? If so, restart Photoshop, does the problem go away?
If no to the first question, try restoring your preferences using this manual method: https://helpx.adobe.com/photoshop/using/preferences.html#Manually If that doesn't solve it, you can quit Photoshop and put the Settings folder back
If that still doesn't fix it, go to Preferences > Technology Previews... and uncheck "Enable Native Canvas Rulers" and restart Photoshop, does the problem persist?