Macbook stuck on apple startup screen with no pinwheel
My macbook is stuck on the grey apple startup screen with no pinwheel or progress cog.
I have tried turning it on while holding down shift, though this does nothing, there is no beep. I have tried holding down the power button while turning on and this produces one long loud beep but still does nothing. I have reset the PRAM and this to have done nothing as well, same goes for when I hold option to choose the hard disk manually - i hear the second start up sound but still it goes back to the start up screen. In all of these instances it just goes back to the grey start up with no cog.
If I leave the macbook for long enough it will make a startup sound on its own, and go to the start up screen again. Any more ideas?? I would be eternally grateful for the help!
Macbook, Mac OS X (10.4.11)