Two things-1. There is a recent update to the HD 4000 software so you might check to see if you have the most recent version and 2. There is another recent thread which ends up recommending using a Radeon 7770 graphics board. I just installed a Sapphire Radeon Vapor X OC1 1GB GDDR 5 graphics board to solve cadence problems with playing DVDs. HD 4000 got some good press when first released, but graphic board have a habit of leap frogging each other. I was trying to create a system that did not need a graphics board. However, I expected one day I would need to add a graphics board. That day came sooner than I expected.
Anál nathrach, orth’ bháis’s bethad, do chél dénmha