What you mean.."mobo doesn't get as far as POST (no beeps, no life), "
Could be memory..
Sorry, I'll try to be more specific.
The motherboard powers up (there's a green LED indicator that shows it is powered), all the fans start, including the CPU fan. However, you can quickly hear the pitch (and therefore speed) of the CPU fan varying.
I said there wasn't the distinctive beeps from the motherboard indicating errors, but in the last few hours I've been trying (without success) to find out for sure whether this particular board even has any kind of on-board speaker to beep with, and the case I'm using has no internal speaker, so maybe that's why I'm not hearing anything.
Needless to say, no signal is getting to the monitor either.
Hope that clarifies, and thanks for your advice, I'll try the DIMM's in turn.