OS 10.4.1 Start Up disk missing from desktop

Is it my imagination or do Macs these days have a proliferation of oddities occurring when you least expect it.
Anyway, my problem is that I booted up my Intel 2.66 dual this morning, it started up fine, system running, apps all there etc. But then I noticed the hard disk icon for my Start Up disk was missing from the desktop.
Its there, its mounted, its running the system, all my apps work but you can't see it to double click on it on the desktop and when you go into a finder window its not listed in the drives available.
Its mounted, its verified, its seemingly all okay but its just not visible on the desktop or in the finder window.
I can get to it by opening a finder window from one of the two other disks attached to the machine and then searching for something on that disk - ping - the file is returned in the finder window with the directory showing the Macintosh HD as its root. I can then select that in that finder window and it opens up the window for the disc.
Any clues as to why this might have happened and more importantly how I can get it back.
Cheers
James

Dale
Oh yeah - just updated it ! The 2.66 dual replaced my G5 Quad which died on me recently. I must say i've been pleased with it so far. I produce CGI work for architectural projects so speed is of the essence. Needs the ram though (possibly not the 8 gig I've got but that's so i can run four renering apps at once with 1.5 gig assigned to each - which incidentally works a treat). When i first got the machine it came with 1 Gig of ram and it was horribly slow, now it flies. Ideally I'd have got a 3 ghz machine but had to buy this off the shop floor in the local Apple dealer (Cardiff) and it was the only one they had.
So on balance I think its a pretty good machine. I've had a few glitches with it but that's down to early release UB software rather than the hardware.

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