I have a pre-Intel iMac, bought in 2005.
The screen display is now littered with around 8 very fine, vertical coloured lines - the turquoise and pink ones being the most visible.
It is my impression more are appearing at a quicker rate now - the first one was there for several months before another one followed.
I intend to buy a new iMac sooner rather than later, but I wonder if anyone can suggest how long this display might last before it gives up - could it suddenly fail completely, or is it likely to just peter out, with more and more coloured lines.
The screen also lacks brightness when turned on from cold, though this is not a serious problem once running.