My mac book pro has a white screen and won't start up

My Mac book pro has been running slow, so I thought I would shut down and reboot. It wouldn't reboot past a white screen and an apple logo. I have rebooted several times and after an hour or so it still won't go any further. Any suggestions?

Howdy Lowana42,
Welcome to Apple Support Communities. 
It sounds like your MacBook Pro has a startup issue that is causing it to only display an Apple logo. Try the suggestions in the article below, they will resolve most issues like this one. 
How to Troubleshoot iSight
I hope this helps, 
-Jason

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