I experienced both types of freezes on my mid 2010 MBP (2.6, 17 in, Core i7 with 8GB of RAM, 10.6.6). The problems actually started with screen artifacts without freezes. The artifacts looked as if the screen did not refresh properly after scrolling and sometimes black squares.
Freezes started later when I created a new user account and moved all my data there. When the machine freezes, usually the screen is garbled, the mouse is not responsive, cmd
altesc does nothing, and I have to restart the computer using cmd
ctrlpower.
I also get the other type of freezes when there is a spinning mouse pointer, but the screen is not garbled and I can move the pointer. It actually happened once when I took the machine to the apple store for an inspection. The tech person suggested deleting flash player plug-ins, but also admitted that the freeze did not have anything to do with flash. He checked the log and found a bunch of errors from Quicksilver. I removed Quicksilver when I got back home, but the machine froze again (with the second type of freeze). There were error messages from Firefox:
11-03-12 9:28:59 PM 0x0-0x2e02e.org.mozilla.firefox376 Sat Mar 12 21:28:59
**-MacBook-Pro.local firefox-bin376 <Error>: unknown error code: invalid display
<<I think we at least have to distinguish between the two main forms of freeze:
1. The freeze with graphics artefacts and unresponsive (frozen) mouse pointer (this thread or <a class="jive-link-external-small" href="http://">http://discussions.apple.com/thread.jspa?threadID=1807105 (143k views) or
http://discussions.apple.com/thread.jspa?threadID=2587510).
2. The freeze with spinning and moving mouse pointer (the threads about 3 Gbps SATA etc.). Supposed to have been fixed by EFI 1.9 but maybe not as you're still seeing the problem.>>