Mac Pro :: Using Red Diagnostic Lcds On ATI Radeon X1900XT
Oct 14, 2009
My ATI Radeon X1900XT graphics card keep tripping out leaving a black screen The card itself has a red lcd light visible on the card when the screen is not working
The card is in an 8 core mac pro and is running a 30" ACD.It started a while a go before installed Snow Leopard but happened very infrequently
Have installed snow leopard and added two new dvd drives and I now have these blackout nearly everyday.
Have found info on ATI's website about the Radion HD 4870 suggesting the LCDs indicate a faulty power supply or even disconnected power leadsthe same thread also mentioned overheating could be the cause a of the red light.
anyone know what the Red diagnostic lcds on Mac ATI Radeon X1900XT mean.
Extra info: The two DVDs I have added I had to replace the data cable as I damaged the original
to do this meant a total strip down, while I was there I added two sata data cable threading them through connecting to a new sata drive and leaving one spare for the future.
The DVDs work perfectly, could adding the sata cables have an effect on the power supply.
Having to remove the ATI Radeon X1900XT, I am sure the cables are seated correctly, should it matter which cable is connected to each connector on the motherboard.
There is a thread on apple website about this black screen, all describing similar problems but relating this to Snow Leopard and some sort of video bug.
No answers on that site and no one else seem to have the Red diagnostic lcd
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Feb 15, 2009
I have newest a Mac Book Pro 15". I would like to find a small and powerful adapter or something small device that can hook up two large 24" or much larger to my Mac book Pro. I saw some adapters in the magazine or some place the website. I forgot where to find. I will use them for Final Cut Pro editing as viewing.
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Jun 23, 2010
I am running a Mac Pro 2,1 and just had my x1900XT die. I know the 4870 isn't officially supported but was told on many a forum that it would indeed run. So I purchased a new Mac HD 4870 card and put it in yesterday. Seems to work fine and the user interface is snappy. However when I run Xbench and just the Graphics benchmarks I can see that I am actually scoring on average 30 points slower than when I was running the X1900! What is going on here? Is the card not being fully utilized due to it not being fully supported on my Mac Pro 2,1? Is it under powered? I plugged in the provided 2 power cables directly to the 2 connectors on the board. However in Cinebench 11.5.29 I scored a 24.96 which is something I couldnt run with my X1900 XT. Anybody have any answers? Extremely frustrating to upgrade to downgrade. Thinking about returning it and buying the officially supported HD3780. I work in Pro Apps all day long and need a good performer.
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Mar 12, 2008
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It seems like the new card isn't recognized properly?
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after a lot of testing we have managed to clear everything around the topic of flashing stock PC X1900XT/512Mb (256Mb is NOT working!!) with MacPro EFI ROM. Thank you all guys at Strangedogs! It WORKS prefectlly! Ofcourse flashing card with MacPro EFI rom reenders card useless in regular PC, you have to flash it back with original bios to make it work in PC again. Link to topic on strangedogs: [URL]
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