MacBook Pro stuck at grey screen and wont boot from anything. Please help?

Jan 10 , 2008 ... I hit restart, now it won't boot . I'm stuck on the grey screen with the spinning .... Hope this helps . MacBook Pro ; iMac, Mac OS X ( 10.4.10) , ... same problem here If U guys find any solutions .... please share ... I'm happy to report that I have my computer back without having to reinstall anything . ...