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That could happen if you switched to Preview mode. Pressing the letter W toggles between Normal and Preview mode.
That didn't do anything in Windows. But you inspired me to check everything in View. I found Normal and Preview under Screen Mode. I have temp. switched to Normal, which covers the entire screen (even the white board) with 1/8" grids/graph paper. :-) And that also contains the pink Margin Guides. It's a temp. fix until I find out what I accidentally did. Thanks.
To get rid of the grids: View/Grids & Guides/Hide Document Grid.
Under View > Grids and Guides
you can show and hide the grid and/or the margin and other guides.