What does a failing screen do?cause it shows like white transparent lines when i play games.The gpu is new but the screen is old.Please help.Also can it be the gpu is bad out the box
Well the most common one is overall dimming and dead pixels, but I think the gpu is the faulty part, since the lines only appear on games I suggest to RMA the card or reinstall display drivers and then try again.
Do you have a spare monitor or any other screen that you can test? If the problem is still there even if you're using another monitor then the GPU is the culprit, if not then your older monitor is broke.