troublehoot

I recently upgraded one of my two displays to a 4k monitor. I had no issues with my system prior, but probably about a week after the upgrade I had sporadic issues where both monitors suddenly turn grey for several seconds and then the entire system almost completely shuts down. The monitors are...

Ive got a recently bought case with 2-usb 3.0 and 1-usb 2.0 slots at the front. It was working fine for sometime until suddenly I noticed that both 3.0 slots are no longer working for any of my USBs (ive got 3 USBs) and even my phone cannot be read it always says not recognized BUT those usb 3.0...