Flashing Gray screen on my desktop and my dock is missing, whats happening?

Hi. I got this problem while ago, when I start it up and log in on my admin account I have this gray screen flashing on my desktop and my dock is missing. But I can still access almost everything but what the **** gray screen flashing is annoying and I dont know where my dock goes. Anyone knows what is happening on my laptop? Thanks.

Sounds like you have assistive services activated (There is a three finger short cut you may have in accidentally pressed)
Check Accessiblity in system preferences
under display make sure Grayscale is not checked
under audio make sure flash display is not checked
As for the dock make sure you haven't got it hidden by placing mouse pointer to each of the left/right and bottom screen edges
If not go to the following folder in finder.
Open Finder window and mouse and click to the Go menu to view list of actions. On your key board press the Option (alt) key and you see a extra action location added after Home - this is the hidden library folder in your Home directory
This contains all sorts of personal setting preferences
Now continue to hold down the option key and mouse click on the Library item to open the contents in the main finder window.
Within the window locate and open the folder - Preferences
Locate this file from within
com.apple.dock.plist
move this to the trash
Shut and restart your Mac
The default dock setting will appear - Empty trash
Tell us how it goes.

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