View Full Version : This is totally weird!

07-13-2008, 02:01 AM

I'm getting a constant and entertaining array of "visual effects" courtesy of my graphics card/logic board, which is less than 2 months old having had it replaced gratis by Apple.

I was just compiling a big vertical image in PS of all the weird graphics stuff which happens and noticed that the image of the line I get across the desktop mostly, actually disappeared and reappeared whilst moving the layer in PS into position.

No line...

... a couple of arrow ups.

in Unity.

The actual desktop often below...

There's something :screwy: going on hey?


07-13-2008, 02:09 AM




07-13-2008, 11:17 AM
I'd stay on top of Apple about that. There have been specific machines throughout Apple's history that just never worked right (iBook G3 video card issue as an example).

Consistently replacing the logic board because the video card just doesn't work, but only until the machine falls out of warranty isn't acceptable.

07-13-2008, 09:33 PM


07-14-2008, 04:07 PM
I'm seeing the same behavior on my PC:thumbsdow

07-15-2008, 04:24 PM
I'm thinking it might be a cooling problem? Seems to happen if it's been on for long periods.

I wonder if it ends up cooking the board and everything else as well? It's going to be tricky to get Apple's attention this time because I'm not sure if I can just easily reproduce it in front of the technician like I did last time?


07-15-2008, 06:06 PM
Mine CANNOT be a cooloing problem.
I'm not farminliar with Mac hardware, but is the graphics card using AGP?

07-15-2008, 07:05 PM
Neither can mine as it turns out, I was just speaking to Apple... just a thought. -Some of the mac books have cooling controls for obvious reasons.

Is yours Nvidia?


07-16-2008, 07:10 PM
Nope ATI Raedon X1300.

07-17-2008, 02:21 AM
Sorry, didn't see it in your signature. Thanks.

Apple were saying it could also be the LVDS cable, I sort of hope it is but don't believe it for a minute.

The board is still under warranty ( being less than 3 mths old ) so back to the shop and wait a bit for the replacement to F up again.

07-17-2008, 04:09 PM
I'm thinking; in my case it may just be the AGP bus has outlived it's usefulness.
After restart, the problem usually goes away & all replies from NT say "Non-reproducible".

07-17-2008, 08:49 PM
Looks like VRAM failing due to overheating; My Radeon X800 was doing that until I ripped the cheesy stock cooler and put a zalman on it; The actual hink sink had melted away from the board... very scary; amazed my board/GPU was not damaged.


07-31-2008, 02:11 AM
... Apparently there's a little GPU extraneous to the logic board in these iMacs.

It isn't that costly but Apple are also replacing it ( the logic board has been twice already) for the total of $0 and 6 months out of warranty.

Admittedly this is my 6th mac and have had Applecare on several of them and my wife is about to buy an MBP. I guess that helps?


08-01-2008, 01:25 PM
We had about 5 quad cores powermacs here that were having all sorts of issues. We finally contacted Apple and they addmited that the machines had faulty beta versions of the Radeon 9600 in them. They sent us new cards, but I hate to think what would have happened had we not had apple care.

Uh sorry, yeah we shipped you garbage video cards and knew they were garbage video cards and never had any intention of ever informing anyone or doing anything about it.

08-02-2008, 01:29 AM
... makes you wonder hey??