Strange interaction between PC and monitor.

Apr 22, 2018
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Hello, I have the following problem for some time now.
Whenever I connect anything to USB or headphones/microphone port my monitor goes black screen for a second. Doesn't happen everytime, but enough to make me worried.
Not long ago my GPU fried and I currently have it on RMA so my monitor is connected directly to my motherboard via DisplayPort cable, I believe this was not happening while I had it connected to the GPU.
MOBO: Asus Maximus VIII Ranger
Monitor: Asus ROG PG279Q
Case: be quiet! Dark Base Pro 900
PSU: be quiet! Dark Power Pro 11 650W