Quicktime h264 Movies stuttering on 2010 MBP 17" but not on 13" macbook

I'm just trying to play movies in quicktime that are 720 H264 Movies. Not big. They are about the same compression and length as 720 apple trailers.
These movies play very well on my wife's 15" intel core 2.6GHz i5 processor with 4 gigs ram.
However on my friend's 17" MBP intel core 2 Duo 2.8GHz, with 4 gigs RAM, this movie nor any other can play in quicktime or isadora without dropping some amount of frames. She has about 357GB out of 500GB capacity available, so its not a case of a full drive. Isadora even turns on hardware acceleration when its running. I've started up the 17" MBP and reset the PRam, and tried only running quicktime but still this studder. This computer is supposed to be used for video playback during some shows and I need to help her solve this problem. I'll probably have to tell her to go to the apple store with my slower computers playing the same file better, but its a huge pain and I'd love to solve this at home. Any suggestions?
This file and others even play completely smoothly on my 13" MacBook Core 2 Duo 2GHz.
They all have 5400 RPM drives, updated quicktime 10 software, AC powered, updated OS 10.6.5.
the 17' macbook has Graphics card
NVIDIA GeForce 9600M GT as well as NVIDIA GeForce 9400
The 15" has
INtel HD Graphics and
NVidia GeForce GT 330M
the 13" has
GMA 950

beningles wrote:
Thanks for your reply.
Any idea why it would only just begin recently? I've never had a kernel panic until this past July, I just thought it might have been my new hardware.
As far as I have seen, that flaw rarely surfaced in Snow Leopard. It was not until the Mac was upgraded beyond Snow Leopard that it became apparent. Some did see it in Snow Leopard, but most of the ones I’ve seen (including my daughter’s) did not happen until a more graphics intensive OS was installed.
If you get pushback from Apple on repairing it for free, you might go through all the Lion, Mountain Lion, and Mavericks forums and print out all the ones that said, “this only appeared after I upgraded to XXX.” Maybe you can argue the case that most were unable to find the flaw until they upgraded, so the three year limit seems to fly in the face of fitness for a particular purpose.
Also, some have noted that after exposing the flaw, downgrading to Snow Leopard did not “fix” it.

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