Question Monitor/motherboard

Jul 4, 2020
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Hi I have an asus computer with a a55bm-a/m32bf/dp_mb Motherboard however the monitor stopped booting up with the computer when I took it apart to clean out the dust with some compressed air and took out the power supply (hba008-za1gt) I cannot remember whether or not a tiny psu cable with a black box at the end of the cable labeled p6 is supposed to be connected to another thing or not. This has happened before and I took it to someone who said it was just loose cables so I'm assuming it is happening again. I've looked at the manual but I cannot figure out if it is talking about the little connector at the very end of a yellow black and red cable??? View: https://www.flickr.com/photos/189179676@N03/50076568426/in/dateposted/
I posted the photos of the tiny black four squared box on the account I could not figure out how to upload the pictures here but please help if you know what is happening here because i sure don't thank you in advance