Why is my Macbook Pro 2011 video garbled after sleep? Occasionally when I open my new (April 2011) Macbook Pro I'm greeted by an unusable system with a garbled display.  Most often I have to force a reboot (hold down power button for 10+ seconds), but occasionally it will fix itself if I close the lid and re-open it.


What is the problem, or what should I look at to find the problem?
Are there other things I could try to wake this laptop from this state?
I can't reliably reproduce the problem, so it doesn't seem that taking it to the genius bar is going to yield useful results, but tell me if I'm making a bad assumption here and I should take it back.




System info:


MacBookPro8,3
ATI Radeon HD 6750M
Intel HD Graphics 3000
If anything else is relevant, let me know and I'll post it.  It's a standard 17" MBP, though I've added memory (notably this problem did occur prior to adding memory as well)
It was bad memory.  I had upgraded to 8GB, but at some point suspected the memory for some other problem, so put the original Apple 4GB back in.  Both problems went away (tested for 3 months) so I ditched the 8GB and got 16GB of higher quality memory that more closely matched the timing specifications of the original Apple memory.

So far, after two months, I haven't seen this or the other issue yet.  So in this case it was bad (or wrong) memory.