Hi everyone, Last week my computer was running fine as it had been since I built it last year. However, one day I left it running while I went take have some coffee and when I returned (after about 1/2 hour) the system was shut off and I could not turn it back on. The fuse in the plug had blown and I can hear a faint static-like crackle when the power lead is connected to the machine. My first assumption was a PSU problem, but I have tried an alternate PSU and power cable in all combinations with the existing units (though I did change the original fuse ) and it makes no difference - there is absolutely no evidence of any disc spinning or fan whirring or any power getting through at all whatever is used. So. Motherboard problem? HDD problem? No idea. Current system is as follows: Gigabyte 775 MoBo 450W PSU 3.0GHz dual-core intel CPU 2 x 2GHz OCZ RAM 1 x EVGA 9800GT GPU 1 x IDE HDD (main with O/S) 1 x SATA HDD (sencondary) 1 x IDE DVD drive Sorry it's vague, but I'm at work now and can't remeber exactly what I put in over a year ago! Thanks for any advice. Gav.