Turning the computer on

After my computer is asleep and the screen goes dark, I move the mouse and the blurred picture comes on. I can't get a cursor to appear by moving the mouse or with the keyboard. (Even though both are on and working). In order to get the cursor to appear I have to shut down the computer with the on/off button and wait for it to restart. Then the cursor appears and I can give my user password. I have the iMac retina and Yosemite 10.10.1. Anybody?

Disconnect that drive.
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.
If that doesn't help Reinstall the OS.

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