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Re: videos on Safari Books Online, and headphone jack problem
For the headphone issue: Make sure you're using a set of stereo headphones, not ones from a cell phone that include a mic. You can visually confirm the type of headphone that you're using by counting the number of plastic "rings" on the connector. For use with the Nexus 7, two rings are good and three rings are bad.
The reason for this is that a stereo mini-plug is TRS (tip, ring, sleeve) and when inserted into devices that only have a stereo-out (i.e. no capacity for microphone usage) they align with the internal connectors correctly and sounds go where they are supposed to go (left and right with a stereo "image"). When you insert a TRRS (tip, ring, ring, sleeve, aka three rings) connector, bundled with every smartphone sold today, into a stereo "port", those extra rings will cause the areas of the connector designated for "left" and "right" audio to be misaligned inside your Nexus 7 resulting in one channel not coming through your headphones. The quick reason for this is that the additional "ring" on that type of connector is for the microphone, which, again, throws everything out of whack when used on devices not equipped with TRRS output via their headphone jacks.
Of course, having said all that, I could be completely wrong about this and you may simply have a bum Nexus 7 on your hands I certainly hope not though...