Hi guys, I've spent today building a pc for myself. However, on pressing the on button there's no reaction at all. My machine specs are: M/B - Gigabyte GA-970A-UD3 Processor - AMD 8270 RAM - Corsair 8Gb DDR3 Case - Zalman Z11 Graphics card - Gigabyte HD7870 PSU - Corsair CX750M (750W) Wi-fi card also installed, but can't remember the name and seem to have temporarily lost the box in a pile of packaging So far I've checked the CPU and motherboard power sockets, the wall plug sockets and the power cord to my PSU. I've also checked the connections between my case and the motherboard, and these all appear to be correct. As part of this final point, I switched the power on LED with the power button (they both originate from the same location so thought they may be mixed up). Anyhows, I got a solid LED, which suggests to me that a) there's power running through the switch circuit and b) the pc isn't booting when told to, as a solid LED would indicate circuit completion,which would be the equivalent of holding in the 'on' button. If anybody could shed any light on where to go next, I'd be eternally grateful (currently searching the house for a paperclip to test the PSU...).