this could be caused by any of a number of problems. the actual brightness could in fact relate to the monitor. If you have access to another one try swapping them and see it that works ie not dim but ok
the second point. you raise ma or may not be connected.I would suggest a memory check maintance( defrag ) and then if required run scanow. all of these subjects are fully detailed already in the forums
Thanks for your quick responses rawprawn, sharpamat & buteman.
I've checked the Device Manager and that reports that the display adapter is working normally. I also ran defrag earlier this week - but I guess there's no harm in running it again. I'll also run scanow and if these don't fix it, repair the MBR.
I'll post an update once I have done these. (Probably next week now as I'm about to go away for a few days.)