MAC Pro early 2008 display goes off during execution of CPU

My Mac Pro screen turns off at random. I have two screens. Most when it goes out when the system processes more than workload, but he died sometimes even its not working any program. Any help would be appreciated.

Details of the system

MAC Pro early 2008

2 2.8 GHz Quad - Core Intel Xeon processor: 8 strands

32 GB OF RAM

ATI Radeon HD 3870 - VRAM: 512 MB

Cinema HD 1920 x 1200

Cinema HD 1920 x 1200

Note the time of the next problem. After the reboot, open the Console app in Finder > Applications > utilities and look for entries of the log at the time of the problem. Suspicious message here.

Also check the fan on the video card. It runs smoothly and free of dust?

Tags: Mac

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