Grey Screen

[Rhisiart]

I had difficulty starting my Mac today. I got a grey screen. I rebooted a few times and each time I was left with just a grey screen. Eventually I rebooted again and this time the Mac started correctly. Any ideas what was or is the problem?

 

[Cheryl]

Any sounds at the grey screen?
Have you run a disk maintenance on the drive since?

 

[emma24xia]

Have you tried to run the upgrade? Apple recently released the new Mac OS X 10.10.