Cinema Display going crazy

[jpdhch]

Hello all,

Below is an image of my Apple Cinema Display going crazy (this is a
screenshot, I get all kinds of similar craziness). This happens when I've
been running a lot of programs (Vectorworks, Photoshop, Indesign and
Illustrator), for a longer period of time (a couple of days) and especially
when using Exposé.

I've had this problem before and replaced my graphic card. The problem
went away and came back a month or two later. -- What else could be
causing this?

I'm running OS 10.5 on a 2 x 2.8 Ghz Quad Core
with a ATI Radeon HD 2600 XT and a 30" Cinema Display...

Thanks,
Jp

 

[nanofrog]

Can you connect the monitor to another computer to check if that's the problem?

Even though you already replaced the graphics card, the new one may have died as well.

 

[jpdhch]

probably not the problem

I've switched monitors with a colleague and the problem went away. My colleague had no problem either. Then, after an hour or so, the problem came back (on my computer, with my colleague's 30" display), but not so extreme (only slightly weird craziness). I guess this means the problem is display-related, but must be inside my computer, not in the monitor.

 

[nanofrog]

I've switched monitors with a colleague and the problem went away. My colleague had no problem either. Then, after an hour or so, the problem came back (on my computer, with my colleague's 30" display), but not so extreme (only slightly weird craziness). I guess this means the problem is display-related, but must be inside my computer, not in the monitor.

More than likely.

How long has your monitor been connected to your colleague's computer?

Just to be sure, if you haven't done this already, let him use your's for at least an hour straight. This will determine if it's overheating if it is in fact the monitor.

Otherwise, it's either the graphics card or possibly a driver issue. My guess, it's the graphics card. Overheating is a likely cause.

Does this behavior occur at startup (computer off for awhile, and is room temp internally)? Or does it occur after a period of use, such as during a period of heavy use of graphics processing?

Something to consider.

Hope this helps.