Blank screen after software upgrade

My iMac downloaded a software update yesterday and restarted automatically. But when it rebooted, I have a white/grey blank screen and the system dies not boot up. After a while, I did a hard shutdown. I let it sit a while, and when I restarted it, I have same thing!! Any ideas?!? Please help!!

I think I found the problem. When I went to apple support to check and see if I could get technical support, an option came up with options, and this was one of them. They said it could be an external device causing the blank screen. They said to unplug all other external devices and then to reboot again to see if that fixed the problem. It worked. I have been having issues with my Western Digital external drive, and I think that was it. I am returning the drive for an exchange and I hope that this issue will not happen again. Thanks again for your help!

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