I have the same problem. It's a known issue with this particular ati graphic card. HP told me they would replace my tx2 but I don't have time to give away the laptop for so long. You can help yourself by heating up the graphic card (eg by puting on a video) and then switching from "Disconnect Projector" to "Duplicate" by Pressing Win-Button and P.

I repair these for a living and this problem is a killer for us. It is the video display going bad. Even the replacements parts are defective and only last a short time. Yes on some the graphic chip is an issue, but the vertical line problem is the LCD. no video or distorted video is the graphic chip. The entire TX series is plagued with video issues, but it is not likely you can just switch brands and life is better. The same inept Chinese company designs all the laptops out there. Planned obsolensence. Accept it.

The problem is from electrostatic field in the screen panel.
The solution is to carefully open the screen panel and add some isolating tapes on the left (short side) part of back of the screen, there are three connector type flexible tapes. Just fix them with back of the screen with self adhesive isolating tape. Enjoy

i have the same problem, and i realy don´t understand how to resolve it. As i read there is many owners of tx2 with this problem. I try to repair by my self, but when the screen is totaly opened, i don´t find nothing wrong.
can you explain beter how to repair the problem, can you make something like a tutorial whit some pictures............ sorry for my Englis, i´m from spain

Thanks, gracias

i put isolate tape in all conexion, under de conexion and fixing it also whit isolate tape. and the problem is there, nothing change. 10 to 15 minutes after swich on the tx2, using the aplication to select external monitor the two lines disapier.
There is a plastic cover that put no touch in red color....... can i remove this plastic to see inside?? or maibe you can send me a picture where show the area to put isolate tape to resolve this problem??
Thanks. my mail is fmatellan@juno.com

Excuseme for my englis... i´m from spain.

Well, to help somebody how can have the same problem, i finally resolve it.
The problem is in one chip that is install in the monitor.
I opened the monitor, and in the back there is a plastic whit a label where you can read in red color, don´t remuve this plastic.
Under the plastic there is a card where is conecting the video bus.
Whel, i remuve the protectic plastic, and there is a silver area in this plastic. On the right of the silver area, there is a small chip, that cause the problem.
I put diferents contact of this chip, to a ground reference that is on the card, on the righ of the chip, whitout power. and the problem disapear.
The problem, maibe, is a electrostatic.
Bye from spain.