Video signal fail

The symptoms- Often when playing demanding games, the video signal will simply cut off. Audio and response to the keyboard will be maintained briefly, but end soon after.
Initially I took my Mac Pro to the GB, however they found nothing wrong with it. When I took it home, the problem persisted.
I have done further tests in an attempt to pin point the problem. First I hooked up a second monitor. During the next crash, both signals went out leading me to believe it's not a problem with the monitor. I stressed the vram through extensive use of motion, using some 400 vram, far more than any game. No crash. I ran the built in memory test (holding f2 at start up), the extended test found no error and the basic test found no error either, but took roughly 15 minutes (i have 8gb of ram.) I then downloaded a CPU stress test, ran it to such an extent that 99-100% of CPU capacity for several minutes, no crash. Despondent, I download a more extensive activity monitor and opened a game. Immediately I noticed that the GPU was running at nearly 100%- much higher than the vram. Could the GPU be the issue?
The graphics card is ATI Radeon X1900 XT btw, 8gb ram, 2x3 GHz Quad-Core

Hiya!
The X1900 XT is often a problem child in Mac Pro's. The card has poor cooling designs, meaning under heavy continued stress it will stop working. One of the main reasons is dust! Have you opened up your Mac, taken the card out and given it a good cleaning? Others have also had a lot of success installing a new heatsinks and coolers, but not for the faint of heart!
Have a look at this website...
http://www.xlr8yourmac.com/Graphics/X1900XTOverheating/ATI_X1900artifacts.html
Hope you sort out your ATI!
-Jacques

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INFO: [mpeg2enc] Pass2 91 91( 1) P q=4.00 RETAINED
INFO: [mpeg2enc] Pass2 92 92( 2) P q=4.00 RETAINED
INFO: [mpeg2enc] Pass2 93 93( 3) P q=4.00 RETAINED
INFO: [mpeg2enc] Pass2 94 94( 4) P q=4.00 RETAINED
INFO: [mpeg2enc] Pass2 95 95( 5) P q=4.00 RETAINED
INFO: [mpeg2enc] Pass2 96 96( 6) P q=4.00 RETAINED
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Last edited by firecat53 (2009-07-16 02:28:00)

Video:
     Codec: dvsd
     Name: DVC/DV Video - MPG2
     Stats: Installed
Audio:
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Hi everyone,
my graphics card is ATI HD7850 and I am using the open source radeon driver.
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Last edited by foobar42 (2014-10-21 12:36:52)

Quote from: Bas on 29-March-08, 19:15:31
Put the old card back in, does it work again?
Anyway, put the old card back in first, see if everything still functions.
Quote from: Fredrik Åsenius on 29-March-08, 22:21:29
Yes, and I was also thinking about the two tuner cards. Do what Bas says first, and only then without them and their drivers.
Correction, three cards!
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Quote
If you, test with a PSU that cann do like 30A @ 12V single line, see what it does.
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Hello, welcome to forum.
"When i turned the computer on for the first time, the system boots up and there is one small beep, sounds like it is posting, but I get no video signal from my monitor, which I checked on my other computer and is working fine, I tried both video cards in the 1st slot, in non-sli mode and I get the same result each time, so I get no video signal with all ways tried?"
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power down PC, remove power cord from the PSU and Clear CMOS Guide
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what D-bracket shows?
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read here:
PSU's---2 x 12v---The Dual Rail Myth
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good suggestion can be found here:
https://forum-en.msi.com/index.php?topic=105635.msg783148#msg783148
https://forum-en.msi.com/index.php?topic=103299.msg757739#msg757739

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Message was edited by: jauqq
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