When Yosemite wakes from sleep, no password entry box.

Installed Yosemite v 10.10 on a mid 2011 iMac. I use the standard energy saver settings for sleep and require a password after screen save and sleep.
About half the time, when I wake the machine from sleep, the enter password screen appears, but there is no password box and no mouse pointer. The icon for the user is there, but nothing else. It also seems there is no mouse or keyboard availability.
I'm forced to do a hard reset, the install scrubber bar appears asif the machine is finishing an install, then I can log in.
Attached peripherals are external drive for back up, speakers and iphone.
I've looked around for similar problems but have not found any. I did do a safe boot to no effect.
Any ideas?
Thanks.

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UPDATE:
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Viking501,
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This is a picture of the screen:
Message was edited by: ekom
(I did click the camera icon to add the picture the first time. I tried it again.)

If you want to post an image please use the Camera icon in the message composition window's toolbar. You cannot just drag one in from your computer, hence why your image does not appear.
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UPDATE:
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Hope this helps someone else down the line... eh hem...

When Yosemite wakes from sleep, no password entry box.

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