My computer won't start up past the gray screen

My computer won't start up past the gray screen and then shows up with the forbidden sign where the apple logo should be. I have tried booting in safe mode and PRAM and neither works. Any suggestions on what I should do next? Or any idease of what might be wrong?

I had the same problem, I believe it is called a kernal panic. They had to replace my hard drive. I did have apple care or it would have cost $450. The guy at the genius bar did some tests to see if he could fix it, he couldn't, so I had to have the hard drive replaced.

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