My 70D viewfinder has numerous vertical lines and I can't access any menu settings. Help.
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Viewfinder or lcd?
Sounds like you might have the grid display on, though that should not just be vertical lines.
Since the sensor data does not show up in the viewfinder, you need to re-phrase your question.
If it shows up in the images, you can post it here.
Try connect your 70D to Canon EOS utility and see how it works from there.
It could possibly be a loose wire of the LCD.