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External HP monitor often shows black screen at start up (using mac mini)

HP Recommended
HP Pavilion - 32" LED LCD Monitor - WQHD Pavilion 65XX
macOS 10.15 Catalina

I bought this HP monitor: HP Pavilion - 32" LED LCD Monitor - WQHD 

When I start it off it often says "No Input signal." When i go to change the input to the input with the signal (Mac Mini), it very often goes black and does nothing. I don't see anything even thought it's on. I'll try powering it off and powering it on to try again. shows "no input signal" and goes black. Over and over. I can't get it to show my Mac Mini signal even though I know it is sending it. I try to have it auto-select input signal. This still often doesn't work. Please help !



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