iMac Problem - LCD/GPU?

dandubi · 22 Mar 2014 at 17:21

Hi,

I am having problems with my iMac but i am unsure if it is the screen or the GPU.

Has anyone else seen this issue? if i move a window to the top left of the screen it sort of looks ok...

I do not have a cable to connect an external monitor to test at the moment.

Many thanks.

deusexlumina · 23 Mar 2014 at 21:17

tried reseating the lcd cable?

dandubi · 25 Mar 2014 at 13:45

Yeah i tried the LCD cable and still the same. If i change the wallpaper it changes the effect of the distortion also..

I'm just not sure if its graphics or the actual LCD at fault.

randal · 25 Mar 2014 at 13:53

What year/spec? It's not an Nvidia 8 series GPU is it per chance?

dandubi · 26 Mar 2014 at 22:55

It's an early 2009 think 2.66 CPU.

randal · 26 Mar 2014 at 23:28

Hmm, not what I was thinking where the 8 series GPUs would start to lift from the logic board... The 20" 2009 2.66ghz models came with a 9400M according to Apple.

Have you tried running diagnostics? Boot up holding D on the keyboard.

There are numerous fixes and such for GPU/graphics problems, but I assume you've installed everything from system update once you're installed?

Is Mountain Lion the only OS you've tried? Lots of people had problems with Mavericks when they installed that - similar symptoms to what you're seeing.