Unfortunately, I had forgotten my PC was active when pulling a house fuse for another item and, naturally, it stopped as well, being on the same circuit. However, on reseating the fuse, everything came back on bar the PC. On trying to start up, I get a green power light but, apart from that absolutely zilch ... no fan noise and certainly no signs of booting up. I had been hearing some mild grating noises on start-up over the past month or so but nothing alarming and it had certainly disappeared by the time it had booted up. The only other possible concern is that I believe I detected a faint electrical overheating smell today. If anyone has any ideas, please break it to me gently!