How to get passed the grey screen with apple logo when turning on?

I got a Imac Intel 20" about 6 years old. The other day turned it on and everscince havent been able to get passed the grey screen with the apple logo on it? What could be the problems and how can i fix this?
cheers

Hello v:
The computer is fairly old and anything can happen.  You could try resetting the SMC and see if that helps.
Barry

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