so over the past year ive had 3 graphics cards. i originally purchased a gtx 970 a year ago and noticed it was artifacting a month or so in so i sent it back and got a new one, after a few months this one also artifacted and since i already returned it i had to purchase a new card. now i have a 1month old graphics card, has worked fine for a while. but today i noticed slight artifacting in the forms of black lines across my screen (i use a 32 inch vizio tv as my monitor). so i was curious as this is now the third card i had that did this and took it into my local bestbuy for a diag. they claim nothing is wrong from what they can tell but it sounds like a graphics card issue although there testing says otherwise. i am now wondering could this be my tv that is causing the artifacting. either due to a faulty hdmi or the screen itself. im wondering this due to the fact that recently the screen has started flickering. if i turn it on then off it usually stops. so far i have posted a few times on these forums and people have said its my powersupply, graphics card or proccessor in various posts. but like i said i just ran a diag and everything came back fine. i will also note that i ran 3dmark11 3 times today to see if there was artifacting in that and none came up. so could it be my monitor? thx in advance for any help.