Today, my 17inch mac pro laptop (5 years old now, hostname "ace") has a vertical strip in the middle. (It occurred once in the spring 2015, but went away on its own).
After some online research, I pressed the glass screen for a few second, and restart by holding CMMD+Ctrl+P+R. The vertical strip went away.
Pressing the glass screen was mentioned at
https://www.ifixit.com/Answers/View/17589/MacBook+suddenly+has+inverted-flickering+vertical+strip+on+the+screen
CMMD+Ctrl+P+R was mentioned at
http://www.cnet.com/forums/discussions/macbook-pro-screen-problems-strip-screen-then-shutdown-588409/
Later in the afternoon, the same vertical strip come back again, after some overheated use.
I tried press the glass and CMMD+Ctrl+P+R again. The vertical strip was still there.
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