1.83, 2, or 2.16 GHz Core Duo processor

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after 5 minutes appear diagonal squares all screen

My mac pro a1150 after use like 5 minutes appear diagonal squares all scree i can control it because i hard to see. also i notice the computer is hot.. some one can help me

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Good luck if you have the Nvidia GeForce 8600GT... if you get the same issue on an external monitor then the GPU is probably failing. It can't be an inverter problem cause the screen has lightning so it's a video related issue.

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Have you tried connecting to an external monitor?

- If the problem still exists it's in your graphics chip (=logic board problem).

''If it goes away it could be an inverter, cable or display problem.


Good Luck,


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I'd rule out software issues by doing a clean install. If the machine heats up as you say - monitor themperatures using something like iStat Pro. If the base revs of the fans is something around 1000, install fancontrol and rise the min threshhold to 2000. It's also a good idea to take the thing apart, give it a good clean and renew the thermal paste under the heatsink. I had a customer machine (MBP 2,16 C2D) behaving exactly like that and fixed it as mentioned (sans the reinstall).

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Eduardo will be eternally grateful.
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