Hello, So I switched my computer off using the wall socket switch yesterday as it was switching off by holding the power button nor do I have an OS to press the turn off button. Now my computer won't start up at all. I have checked everything and all the plugs seem to be in the right place, changed power supply, changed processor, taken out hard drive, graphics card, RAM. But still nothing. There is still a green light on the motherboard which I know means the PSU is not to blame. This is my brothers old PC and he said this has happened to him before. He said he just waited a few days and tried turning it on again, and it came on. Has anyone else had a situation like this? I don't get how the computer can not work then magically work again.