Hi. I recently built a custom computer and it worked fine, until a few days ago when I was playing a PC game. Randomly, my mouse, speakers and wireless adapter stopped working, and those were the only things plugged into the USB ports. Then the keyboard stopped functioning as well. Since both USB and keyboard stopped working, I suspect that it is my motherboard acting up or BIOS problem. Can anyone explain to me what the problem is and how to fix it? I have tried removing the graphics card and using the motherboard integrated one and it still happens, so I don't think my PSU is at fault.