I have a bit of an odd problem - which may be entirely PSU-related, but perhaps not. I've had my latest build up and running for the past three weeks. Every two or three days the PC will refuse to turn itself on in the morning, and over the past few days it's become more of a daily problem. If the PC is switched off for a couple of hours during the day it can be turned back on properly without any difficulty, it's only when it's left overnight that this problem has manifested itself so far. I've managed to work out a reliable, if temporary fix, which is to switch off and disconnect the power supply, push the "On" button on the PC and wait a couple of minutes for any residual electricity to dissipate and the lights to fade, then reconnect the power cable and turn it back on. It's not enough to just turn the PSU off and on again. I have to totally drain the system then reconnect. it. While this method works, I have no idea why it works, or more importantly what's going on in the first place. The PC was originally plugged into a surge-protected extension cable, then I tried plugging it directly into a wall socket, then I tried plugging it into a different wall socket in the same room - with identical results each time. The PSU is a Corsair 1000W model. It's six years old, but it had still been in its shrink wrap until this build. If the PSU is not actually dead, why is the PC behaving this way? Could it be to do with the wiring in the house? It's a 1930s build if that adds anything There's a bit of history with prior PSUs which I've used in the same room which makes me wonder. I'd used another Corsair 1000W PSU in a previous build which died completely after just a few days. That was then replaced by a Super Flower 1200W PSU and that also died within a couple of days. I was sent a replacement Super Flower and that one worked perfectly from the off without any problems at all. It's been used daily for the past several years in the same room, and is now in use elsewhere in the house. Have I just been unlucky or is the house wiring somehow harming my power supplies? Do you know what's been happening and why?