Try plugging in an external display. If it doesn't have a yellow  
line, its the LCD in the iMac. If it does, the GPU is failing and the  
logic board will need replaced.
On Nov 12, 2009, at 5:35 AM, William Spencer wrote:

> Hi there: The older of the two machines below has just developed a  
> thin vertical yellow line, just left of center, that sometimes  
> flickers but not usually. I assume it's simply one of those things  
> that happens but am wondering if it's a symptom of something more  
> ominous than just an annoyance. How urgent might it be for me to  
> get it looked at? And since--of course--it's just beyond the three- 
> year Apple Care term, what are my options for where to get it  
> looked at and how much might this cost me? As always my thanks in  
> advance!
>
> ***************
>
> Bill Spencer in Maryland
> IMac Core Duo 2.4 ghz/1 g RAM/Snow Leopard
> IMac Core Duo 1.83 ghz/1 g RAM/Snow Leopard
>
>
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