Ok, I replaced the motherboard with an Asus M5A78L-M/USB3. And also picked up a 1 GB stick of Kingston DDR3 RAM. Yet still nothing! I tried several beepers but could get any of them to make a sound (even when connected directly to 5v and ground) so I replaced it with an LED (working). No...
Ok,
I've rebuilt the system with just the cpu, cpu cooler, psu, RAM and a fresh speaker.
No output from speaker when turning the system on. And the same result if I turn it on without RAM. However the cooler does spin up
Everything is wired up correctly as far as I can tell (both the 24 pin and 8 pin are connected to the motherboard, the fans are plugged in correctly). Upon turning on the fans spin up as does the hard drive if connected but no beep codes are emitted and no display outputed.
Power supply was bought new and works well enough to power the board at least to the extent of fans and LEDs, it also seems to power up the GPU no problem. I wondered about the power since seeing this post...