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Can You use the buttons? Press the right button with a white bar, just below the screen. This should open the Tools menu. If it does, use Exit and leave AppCenter. If this works, You can test if the touch screen is defect or if AppCenter installation is corrupted. If the screen is ok, reinstall AppCenter.
I suggest try to calibrate the monitor, while calibrating the monitor and it has the white line it could be a hardware problem that the monitor is bad but if you want to make sure try loading to BIOS and see in BIOS if it has the white line, If so, It really means that its really a hardware problem.
The reason it has white lines is because the glass is dirty in the inside. If it has one speck of anything inside the scanner it turns into a line because it stays in that one place as the picture slides over it. So that line is actually a dot that is covering the picture throughout the scan. The solutions don't work. I don't suggest taking yours apart. I took mine apart and cleaned the glass. The pictures scanned fine and then the lines show up again. The real solution is to get your money back if you can. It will do this over and over. It's a design flaw in the scanner. The picture is actually squeezed as it it scanned. As pictures are squeezed against the glass... residue builds no matter how clean your pictures are.
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