Powerbookrefused to startup

in Genius Bar edited January 2014
I desperately need help and I will be grateful if someone can help me solve my problem.

I'm using a powerbook running OS Tiger.

I left my powerbook running while I was out, and when I came back I got a mesage telling me that I need to restart my powerbook. My mouse couldn't move and I had no other option but to press the 'power' button.

My PB refused to start up after I powered off and on. What is the problem? I tried pressing Apple-S upon startup but to no avail.

Earlier today, I ran disk utility and repaired my HD successfully. I am therefore puzzled as what could be the problem.

Please advise me!

In despair,

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