HELP.  After restart, only a white screen remains

After downloading Mavericks last night, I tried installing it this morning on my iMac.
After the loading bar suggested 1 minute remaining, when it got to 1 second, this lasted for about 30 seconds before the bar disappeared and text stating 28 seconds remaining showed.  This counted down to 1 second, the system restarted, and then a white screen appeared.
And that's where it has stayed for several hours (leaving it just in case........).
The only other thing happening is that I can consistently hear what I think sounds like a relay clicking every 5 to 20 seconds.
I have switched the iMac off and on and also tried the Command & R whilst switching back on - but it just comes up with a pure white screen again.
I also have a MBA which loaded Mavericks fine which is where I'm typing this from.
Any suggestions please?  Or is it a trip to the Apple Store???
Cheers

We have the same problem since 15 days, any machines. We think that :
http://support.apple.com/kb/ht5371
Last RAW 5.0.1 update is buggy, but still investigating.
Our previous disk image (10.8.5) from October the 8 works perfectly, then after update we randomly have this issue.
So I agree with you, there is some trouble and the classical response :
http://support.apple.com/kb/TS2570
is not an option.
Please Apple, do you work correctly as you have done it in a recent past.

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