Arghh!!!! Nothing on the screen.
The mobo, CPU, RAM & SSD are new, the case, PSU, HDDs & ODDs are not. Fitting the mobo went very well, had to unplug all the HDDs to fit in the SDD but have plugged them all in again and I can feed the HDDs spinning when the power is on. The ODD opened when I pressed the button and I slipped the W7 disk in. It was opening & closing itself rather than opening & staying open.
At first the CPU fan started & then stopped after a few seconds but reseating the RAM fixed that.
I've not plugged the SATA cables for the HDDs in, just the power. I've taken out the BIOS batter for 30 seconds or so, I've tried DVI and VGA cables to the monitor. I've double-checked the horrid tiny little plugs from the front panel, they seem OK. Certainly the power button works as does the power LED.
Mobo is a Gigabyte F2A88XM-D3H, CPU is an A10-7800 so there are no expansion cards plugged in - the monitor is plugged into the graphics on the mobo.