Hi I own a really old iMac like a 2010 edition, and I have never had this problem before. So yesterday morning i was watching some YouTube videos and another application was open.(minecraft). So while watching the video my screen started shuttering and it crashed. I thought it was no big deal but it kept happening so i went off for a few hours. I went back on in 4 hours, and it kept happening. After a couple of times or it happening when I turned on the computer, there were a bunch of vertical and horizontal lines and it wouldn't show the login screen after the apple sign disappeared. So I tried a bunch commands and finally went to safe mode and got to login. Its working fine and i can open apps and login, but the wifi wont work and the had this screen so i can barely see anything. But it's like the picture below now im talking a picture of what it looks like. Please help I can't spend money and there are no apple shops near me.