Yes there are two 6 pin pci connectors that need plugging in for the 560 ti, just one for the 4850. (Still can' get the 560 ti to put out a signal)
For the onboard graphics should it just be the case of plugging in the monitor to the hdmi slot on the mobo? (I am using a dvi-d to hdmi converter but can't get that to put out a signal too)
Anyway with one stick of ram and using the 4850 I have installed windows, not had chance to play around with it but it looks like it is 'cold booting' if that's the correct term. I left it last night several times displaying the desktop but when I came up 30 minutes later each time it had rebooted itself back to the log in screen. I have put the other sticks of ram back in so may be worth taking them out again to see if they are causing the boot issue.
Next job is to update bios and drivers, ha had enough by last night and so had some beer, which was nice! At work now so will be this evening before I get chance to work on it.
Dark Mantis you are correct in that I didn't say it wouldn't boot originally, it was a typo by me last night, I meant I couldn't get it to load windows not boot, my bad.