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The bottom half of the touch screen lights up but has no graphics, it "beeps" when touched like it would normally, however you cannot see what you are touching. What is up with that?
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@tiffanykotzman either a loose cable on the display or a failed display. It may have lost contact with the LCD driver board which will then cause the error. Download the service manual from here Puritan Bennett 840 Service Ma.pdf Check around page 352 and on to see if you have a loose connection etc.
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