No, I am not talking about my laptop. My desktop gaming PC will randomly "die" every now and then. When it happens, the screen goes black, all HDD activity stops, then anything plugged into the USB ports loses power/stops. The PC though, keeps running. The case LEDs, fans, PSU, GPUs stay powered on. Holding the power button down on the PC does nothing. The only way to turn it off it to switch off the power supply or unplug it. After I plug it back in and reboot it everything seems fine. Could it be a hardware issue?