It appears the problem with my display not restarting after resuming from a sleep or hibernate state has resurfaced. I thought a reinstall of SP1 had done the “trick” though now that appears not to be the case. Over the weekend the machine had rebooted while unattended which in my case means the desktop was sitting in OSX. I restarted the machine, this time selecting the Vista partition, which presented me the standard boot menu saying the previous shutdown had failed so I selected “Start Windows normally”. At that point, the machine hung on the progress meter on the Vista boot screen and I had to hard reset and reboot again which, with fingers crossed, worked.
I’ve been trying to think what might have sparked all this and all I can come up with is the fact that I switched momentarily into the Aero UI from the Windows Vista Basic color scheme to get a screenshot. I’m now likely to uninstall SP1 for a final time as this close-the-lid-and-pray just doesn’t cut it for me.