Last night, I bought a 2008 (I assume cause that’s the copyright date on the bottom) iMac from a very generous individual for $5. Not knowing what condition it was in, I plugged it up and turned it on. It chimes, the screen comes on for a second, then goes right back off. I tried plugging in an external monitor. I can see things on the external monitor albeit with a lot of artifacting. I don’t want to believe it’s the graphics card cause when I move my mini display adapter the artifacting clears up. So, any ideas? Or am I screwed?