What does a green screen with graph mean?

Hello,
Just had a strange inciden happen to my computer. I was away from it for a about half an hour, left my scrivener writing program open. Returned to it, the screen saver was going, when I hit the up arrow button to get out of my screen saver, suddenly got a green screen which had a graph pattern on it.
Locked up. Held the power button in back for a few seconds, nothing was happening. Tried again, finally restarted the computer and now things look ok. Except very strange behavior when I went to reopen my scriverner program, up in menu bar there is no longer a menu bar for the scrivener program--instead it shows macs File menu bar. Very strange.
Have I been attacked with a virus?
Help most appreciated.
P.S. Read some articles online that today July 9th, people with malware on their mac machines will be shut down. What the heck does this mean?

Hi,
Well--I now understand what the blank green screen was all about regarding my first question.
No need to take photo. It's my screen saver!
Twice today when I return to my computer, and tab the keyboard to awaken it, (the screen saver which now shows a screen saver image rather then the blank green screen)  freezes. Try keyboard commands but nothing brings it out of freeze. Have to resort to tabbing the power button to restart computer.
Could it be I need a new graphic card or something else?
Also, last night had a repeated issue while browsing Safari--spinning wheel--have to restart computer. Curious what causes this sometimes when in Safari. Never happens in Firefox.
Help always appreciative.

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