I had my computer open and I noticed there was a big build up of dust on the fan that cools the processor, so I removed the fan and cleaned it, before I replaced the fan I turn the computer on, (Yes I'm an idiot) the computer was only on for about 6 mins, I didn't notice any heat build up, and it wasn't carrying out any heavy tasks. I decided for some reason to install the fan back whilst the computer was on (Again I'm an idiot...) whilst I was screwing it back in the computer suddenly turned off. Once I had reconnected the fan I tried to turn it back on, but now there is just a steady orange light and nothing happens. I tried removing the RAM, Graphics card, anything plugged into it, I even replaced the CMOS battery. I disconnected the power supply into the motherboard (Brown and Black Cables) and all the fans start up, but as soon as I plug the motherboard back in, nothing. Does anyone have any ideas how to fix it?!