...sometimes. So here's what happens. Every so often, when I need to do something inside my PC, after finishing, I'll plug everything back in and it won't power up. Now I'm very careful, I use an anti-static wrist strap, I unplug everything and earth myself properly and so on and so forth, but sometimes, upon plugging everything back in, I get nada. And then, after much power button holding and swapping of power leads and sockets and prayers to whatever deity will listen, it will finally start up, at which point, I'm usually good to go until the next time I need to open her up. So, my question, what is this likely to be, the power button itself or the PSU? I haven't done any extensive testing, but it only tends to happen after I've switched off power to the PSU, switching on and off my PC normally doesn't tend to have this problem. Any ideas?