Problem with iMac stuck on white screen apple logo

[JSmoove05]

So I'm running lion I was having a problem problem with iMac running kinda slow so I restarted the computer and Now it has been stuck on the apple logo screen how I can fix this??

 

[simsaladimbamba]

Have you tried any of these steps?

Mac doesn't boot

Resolve startup issues and perform disk maintenance with Disk Utility and fsck​