Moniter or graphics card

Most likely the graphics card. One question: do you see the vertical lines during bootup? If so, then it's definitely the graphics card.

Try another monitor on the computer and if you still get vertical lines suspect the graphics card... Try reseating the card and then simply replace the card.

There is the one question can you boot up into safe mode and do you still have the lines.. If not then suspect video setting to be altered.. and you will need to make the necessary setting changed in the display setting property.

Good luck

Is this monitor close to another monitor, or to speaker or any kind of power adapter?, if so, just try to move it as far as posible because it is just interference you can see.
if your monitor is not close to any other powered device then can you check if it happens only when you start up Windows, can you boot on DOS mode and check if you have the same problem?,
If you still have the problem even on DOS or Safe Mode it means that your Video Adapter is not ok.

Good luck,
@lberto

i had the same problem, increasing the desktop area removed the lines

Check the display resolution against the monitors max resolutions..

Some monitors cannot handle certain display resolutions. If the monitor seems fine on other systems, then it shouldn't be the monitor. Try another monitor on this system.

Try changing the adapter refresh rate to adapter default in the display settings under the advanced section, then look under the adapter tab.

Boot into safe mode, and change the video adapter to a standard vga adapter,a nd download and install the latest video drivers. Start with the display at 640x480 withthe new drivers, and go up in resolution form there. If you hit a resolution that mimics your problem again, you know it was just a resolution problem.

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