Urgently need help: blank white screen at start with unusual symbol...

Hi guys,
I just turned on my 24 inch early-2008 model iMac, and it came up with a blank white screen, with a grey circle and a line through the middle of the circle. It doesn't say what this means in the manual. Recently, I have been having numerous troubles with my iMac, and I have seen the symbol of the grey folder with the question mark, but not this new symbol. I only just got off the phone to the Apple people when this happened.
What does this mean? Is my computer done for?

Have a read here http://support.apple.com/kb/TS2570
For starters, start your Mac while holding down the Alt/Option-key until the Boot Selection screen is shown.
Choose to boot into OSX (usually the icon labeled Macintosh HD).
If succesful and you get into OSX go to System Preferences the Startup Volume and reset your OSX to be the default.
Stefan

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