I've just done a new build, which consists of: Asus P7H55-M 2x2gb Corsair RAM Intel i5 Win Power +Plus 750w PSU ATI Radeon HD 5850 I put all the pieces in place but I get no signal to the monitor. I've tried removing each component one by one until I am left with only the CPU, but still the error continues. I've tried the onboard graphics when the GPU isn't connected but it still happens. What could it possibly be? I've reset the CMOS, reseated the RAM and CPU, but nothing helps. I've also tried unplugging the power and holding the front power switch on for 30 seconds but to no avail. I've never even heard of the PSU brand so I think it might be a problem with the quality of that. It was £32 so yeah...not great quality. There is no beeping although I'm not sure if the motherboard even has a beeper? At the moment, I'm trying to get it working with the onboard graphics to eliminate the possibility of a graphics card error. I've tried: Removing each component one by one until left with just the CPU. Unplugging the power and holding the on switch for 30 seconds. A known working PSU. Reseating and re-plugging everything. Resetting CMOS. 3 monitors via 3 different cables - VGA, DVI and HDMI. Building it outside the case on a non-conductive surface. I'm baffled. Thoughts?