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I am sorry to hear that have had issues with graphics controller on your system.
I see this problem started when you upgraded to Windows 8.1, please check with Microsoft for possible updates.
Do you know if this issue happen when using different software players?
While researching on this matter, our documentation talks about support for Windows 8 and Blu Ray playback, however, it does not mention win8.1.
I will check with engineering and will post my findings.
Please take a look at this URL for more information.
Thanks Allan. I was able to fix the HTPC problem by downloading the engine management package for Windows 8. The same EMI driver was loaded but something in the package resolved the issue for the Intel Mobo. The Dell XPS12 still has the issue and may be due to the embedded display port used for the graphic output. It appears MS has not included that in the HDCP rules for compliance. The iMac may simply be too old a hardware.