Display issues on Imac 20" - White - Intel 2.16 ghz.

My 20" Imac's (White - Intel 2.16) display has been having a major issue. It looks like only half of the pixels are working...there are small vertical lines across the entire screen. As a result, the display is darker than usual and it makes text appear blurry and hard to read. The problem started off intermittently, but now it is a constant problem. I've tried resetting the Color to Thousands instead of Millions and I've tried resetting the PRAM and of course the tried and true "hitting the top of the computer", but to no avail. Does anyone have any suggestions? Could my video card be going bad? It's the Radeon X1600 by the way.
Thanks for your help.
Parkerhead

The link posted by brado is for the previous generation of the iMac and the new iMac's are completely different even if they look similar. There is only one screw on the bottom of the computer and that is the ram access door.
In order to "split the case" you have to remove the glass that is covering the lcd and access the screws under the glass. I would just get a build to order 24 inch as it is easier then trying to do anything on new 20" iMac. Plus you will probably lose any warranty in the computer.

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Link to picture
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Moderator note; picture(s) converted to link(s) About Posting Pictures In The Forums

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http://img97.imageshack.us/img97/7436/photoijr.jpg
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Superuser
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GPU/display issue?

Hi
I'm having a serious problem with a mid 2008 intel (alu) iMac (2.66GHz Core 2 Duo, running Mavericks). I think from my searching around that it may be a GPU issue, but could also be display.
The mac won't boot properly, getting no further than the grey screen with apple logo. If started up normally, this screen displays a checked pattern. It goes nowhere and the only way out is to do a hard shut down.
I can boot in safe mode though. In this mode, the mac generally seems to be functioning OK, but instead of checks I have a very fetching set of bands/stripes. They are sometimes pink and orange, but at the moment they are white and turquoise. Each band is made up of a series of eight stripes, each stripe a few pixels wide. There are 13 bands across the screen: the desktop can be seen underneath/through the bands and can also be seen normally between the bands (so I have normal bands and striped bands, each the same width, repeating across the screen). The cursor arrow attracts in own mini striped band - a square the same width as the main bands. (image upside down for some reason!).
As I say, my googling suggests that this is probably a GPU issue (the ATI Radeon HD 2600 Pro, not the apparently dodgy NVIDIA one that seems to have cursed some early 2008 imacs). What I don't get is why I can boot in safe mode but not at all otherwise - what gets disabled in safe mode that allows it to bypass what is otherwise an apparently total barrier to successful booting? When I try to boot normally and get stuck on the Apple logo, I can hear the mac working away, but is just doesn't seem able to go all the way. The really weird thing is that even when it is stuck at this stage, I can still remotely access the iMac from my MBP - I can open and copy files over the network. This suggests that it is in fact sort of booted, but just not displaying itself. I cannot screen share though. When booted in safe mode, I can screen share, and the stripes show up on the shared screen view on the MBP. Again, this suggests to me it is a GPU issue, not a display issue.
Unfortunately, this is my old iMac whcih i have just passed on to my mother in law, who is based 250 miles from me. I am visiting for a few days and so need to either get it sorted or conclude that it's toast (seems little point in forking out for a new GPU for a near six year old machine, even if I could swap it). I don't mind taking it apart (I swapped the hard drive last year) if that woudl help identify the source of the problem.
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Hi Tammy (and anyone else who can help)
That's good news. Things at my end have gone a little strange. I put back all the extensions one by one and was able to boot nromally, even once all of them were back. I did however get a message that the ATI 2600 extension wasn't installed properly, but as it was still booting and I couldn't see any way to reinstall it (other than just popping it back in the extensions folder) I moved on. The screen was getting a bit worse, but still just striped rather than banded.
Having read further threads on similar problems, I decided to take the whole thing apart (great ifixit step by step guide). Nothing seemed amiss - all connections seemed secure, no obvious burnouts. Removed a LOT of dust and put everything back together again.
The machine started straight up when I plugged the power cord back in (I didn't get a chance to press the power button) - the screen flashed briefly round the edges and then stayed black. No stripes, no bands, no image.
I could hear the hard drive spinning, so pressed some buttons on the keyboard and got a warning tone, suggesting some sort of boot. I forced shut down and restarted and then tried to log in with the screen still blank. The bad news is that the screen has stayed black since then. The good news is I now have full remote access and can even screen share. The screen now has no bands when I screen share - I can see and interact with the full screen as normal and have managed to retrieve files etc over the network.
I am still deciding whether to order a new (second hand) video card. Looking in system profiler to get info on this it now shows no info AT ALL under graphics/display and in the 'more info' tab from the apple menu 'about this mac' version of system info it now says "No display detected". I am now unsure whether I have somehow 'blown' the display (I still get a brief white margin round the screen on start up) or whether both graphics card and screen are both goosed, or whether I should take it apart again to make sure the display itself is properly connected. If the graphics card was fubar, would I be able to see anything at all via screen sharing? I don't have an external display I can test it with. I don't want to fork out for GPU only to find it is the display.
Any views on next steps?
Col

Display issues on Imac 20" - White - Intel 2.16 ghz.

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