Macbook won't start - apple icon turns to circle with diagonal line/slash

My Macbook won't start. When I turn on the power, the apple icon appears but then after a while it changes to a circle with a diagonal line/slash, then it just shows a gray screen.
The last time I used the computer I did several software updates. Could this be causing the problem? Any suggestions for getting my computer operating again?
Thanks for any help/advice.

Yup, i encountered the same experience after a strange failed USB-loading, and a sudden shutdown of my macbook.
Luckily i manage to "safe-boot" (pressing "Shift" key once starting up the mac) my macbook so that i can save the necessary files before will lose them all.
After that i popped-in my SL Installation DVD, and did the reinstallation process. Fortunately, everything works as charm and everything is back to normal after Spotlight has done it's hard work.
Happy Apple user once again.

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