Q: scrambled graphics with Yosemite

The graphics on my monitor get scrambled and then the computer freezes and has to be rebooted. It happens randomly, regardless of what I'm doing at the time. It started happening just recently but I upgraded to Yosemite 10.10.3 a few months ago. I tried resetting the PRAM but that didn't help.

PowerMac, OS X Yosemite (10.10.3)

Posted on Jun 3, 2015 10:31 AM

I have this question too

Q: scrambled graphics with Yosemite

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by BDAqua,

BDAqua Jun 3, 2015 11:50 AM in response to treadwellblackwell
Level 10 (123,780 points)

Jun 3, 2015 11:50 AM in response to treadwellblackwell

Wait, I think you have a Mac Pro, PowerMacs cannot run OSX past 10.5.8.

Per your other post,try taking a Screen Shot of when it's scrambled...

How to take a screenshot on your Mac - Apple Support

Once rebooted check that png to see if it's the same.

Also, AHT...

http://www.macissues.com/2014/03/21/how-to-run-and-interpret-apples-hardware-tes ts-on-your-mac/
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by treadwellblackwell,

treadwellblackwell Jun 4, 2015 8:23 AM in response to BDAqua
Level 1 (0 points)

Jun 4, 2015 8:23 AM in response to BDAqua

Sorry - you're right - I'm on a PowerMac G5. However, I am unable to launch AHT from the DVD. I tried holding down "D", command-D and "C" (which is what the Read Me file says to hold) and nothing works. AHT will NOT launch.

I should also mention that I no longer have SOUND on my computer. So, that is another issue in addition to the scrambled screen. I wonder what those two issues combined indicates. It seems like it's more than a graphics card hardware issue if sound is also involved.

Any other troubleshooting ideas? I have spent way too much time on trying to get to the bottom of this without any results. Thanks!
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by BDAqua,

BDAqua Jun 4, 2015 9:44 AM in response to treadwellblackwell
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Jun 4, 2015 9:44 AM in response to treadwellblackwell

Try 3 Pram Resets in a row,takes a bit of time.
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by Allan Jones,

Allan Jones Jun 4, 2015 4:24 PM in response to treadwellblackwell
Level 8 (35,242 points)

iPad

Jun 4, 2015 4:24 PM in response to treadwellblackwell

Sorry - you're right - I'm on a PowerMac G5.

No PowerMac G5 can run Yosemite. They are hardware constrained to running mo higher than Mac OS 10.5.8. What OS version to you really have???
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by treadwellblackwell,

treadwellblackwell Jun 4, 2015 6:13 PM in response to Allan Jones
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Jun 4, 2015 6:13 PM in response to Allan Jones

I Should probably start this thread over again. I'm on a Mac Pro running OS 10.10.3. My monitor scrambles randomly and I have lost all sound. I reset the PRAM and tried running AHT but couldn't get that to work from the system DVD.
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Q: scrambled graphics with Yosemite

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by BDAqua,

by treadwellblackwell,

by BDAqua,

by Allan Jones,

by treadwellblackwell,

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