User accounts no longer show on login screen!

I needed to clean my wireless keyboard after spilling coffee on the desk.... I turn around and next thing I know, the desktop is completely blank, and the picture has changed to default. I pressed every key combo I knew, but could only create other desktops. I had no access to system prefs, Finder or the dock! So I had to press the power button to reboot and when it did,  no user accounts showed up on the login screen! Can not get back in to my iMac! However, the user accounts do show up in safe mode login. But even though I removed all startup items from the User Account config in System Prefs, I still get a blank login screen when I reboot!

Thanks for your help. Restarting in automatic login did get me back into "a" desktop, but it wasn't my normal desktop. It was the blank empty desktop I saw right after the problem started. I could not do anything in this desktop, since there was no dock, no Finder, no System Prefs. Only two empty folders I had created, which could not be opened (open them once, they shoot to the right side, disappear somewhere, but do not open on the desktop). Hitting F3 or F4 to view other desktops did not show my normal desktop - only other empty desktops like the one I was in. But when I tried the Command + F1 combination, that switched me back to my normal desktop! It includes the dock, the system bar and the folders that were on the desktop - plus the new folders I'd created in the empty desktop. But oddly, after 5 seconds of switching into my normal desktop, the background changes itself from what I originally had, to the bubble background of the "empty" desktop. 

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