my monitor seems to turn off whenever the pc comes out of sleep mode, although not every time. It then will not turn back on until I reinsert the power cable. A lot of people have been telling me to turn off 'PLL over voltage' but my bios has no such setting and its power configuration is locked. It's a dell pc, I installed a r9 380 in it a few months back and everything has been fine until I got this monitor. And I can't send it back until I am sure it is not a issue with my PC.