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holt

 
Member Since: Jun 10, 2012
Posts: 2
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Everything shuts off but the sound.
I'll be performing a task on my Pro Mac (be it Photoshop, email, watching a video, etc.) and the screen will go black. The wireless keyboard will not respond. The wireless mouse will not respond. It's as if the computer shut down, but the drive is still spinning and, if I'm playing music or watching a video, the sound still comes through the speakers.

No attempt to "wake up" the computer will work, so I have to force it to shut down. If I restart right away, the problem is still there. However, if I wait 5 min or so, and shut down all power to the system, I can restart normally. But the problem will occur again, be it 10min later or three days later.

I thought it might be an application or driver conflict, but I couldn't figure it out on my own, so I've erased my startup drive and done a clean install of Snow Leopard. I've even updated SL to 10.6.8. The problem persists. And it seems to come in bursts. Long stretches of several days of normalcy between "crashes" followed by "crashes" every 10-15 minutes for a few days then back to the long stretches of normalcy again.

The problem started right around the time I signed up for Netflix streaming. At first, I thought it was a problem with Microsoft Silverlight (which is needed to view videos on Netflix.com). If I watched a video in full-screen mode, it would guarantee a crash. However, if I watched a video in a normal window, the crash may or may not occur. It occurred more frequently with the new version of Silverlight, and I was able to get around the problem (sometimes) by installing an older version of Silverlight (v4).

The problem occurs even on Flash-driven videos, so I began to suspect Flash as well.

Now the problem can occur any time, video or no video. It crashed on me a minute ago while checking email (with no other applications open).

I'm completely baffled. I can't find anything online about this problem.

Can anyone shed some light?

Specs:
Mac Pro
Dual Quad Core Xeon
16GB RAM
Three 750GB internal hard drives
One 2TB internal hard drive
Dual Super drives
20" cinema display
Wireless keyboard & mouse
OS 10.6.8
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