my ipad 2 has no sound after upgrading

Hello there, divadaphne.

The following Knowledge Base article provides some great troubleshooting directions that are applicable for your iPad:

iPhone: No sound or distorted sound from speaker

http://support.apple.com/kb/ts5180

Thanks for reaching out to Apple Support Communities.

Cheers,

Pedro.

Was having the same issue and noticed that candy crush app was only one that had sound. Deleted candy crush and now I have sound back!

This short video (1min36sec) is a good 'checklist' on how to bring sounds back to your iPad:

http://www.youtube.com/watch?v=SDf1LDcE95Q

Besides the obvious 'side-switch/muted' option, sound problems on the iPad/iPhone are not as 'rare' as people think - actually, a single crashed/missbehaved app can, under certain circumstances, render the sound-system innoperable... So, it is important to try closing all running apps (then wait some 20 seconds so the system can really close them underneeth...) before rebooting the iPad.

In rare cases you can have a 'hardware' issue... most of the times simply dirt/moisture in the dock connector or in the headphones connector... that keeps the iPad in 'headphones mode' or sound only going out by the docking connector... A soft Dry toothbrush is handy to clean the docking connector... People report that inserting and removing, gently, some headphones plug a few times can restore the propper detection that there is no actual headphone inserted so the sound can return to speakers....

Good luck to everyone with sound problems - it is not too complicated to have it back.