Question Second monitor goes black each few seconds after cleaning PC

[barakiva1]

Yesterday i've done a very thorough cleaning of my PC. I have unscrewed GPU, Fans, and Cooler. Used brushes to whisk caked-in dust from individual GPU fans and then fanned it with a powered air duster. Today I boot up to notice my second monitor (Display port one) goes black every 5-15 seconds. I should notice this already happened whenever the AC made a clicking sound, but at a much lower frequency (either every 30m or few hours). When cleaning I made sure to touch the PSU case (plugged in and turned on) every few moments.

 

[helpstar]

did the fans spin while you used the air duster or did you prevent the fans to spin?
try using a different DP cable or change the port