Half dead sound system

[LinearB]

I am new to this form, so this may have been discussed at some point. But I have a 2008 S80 with the Dyna audio sound system and it just quit... you push the power botton and it comes up on the display with high performance sound system and then just shuts down. any ideas? or has anybody else had this issue and was it major or minor. I would rather not take it to the dealer if I don't have to. any help would be great. also after taking another look for the simple reasons I noticed that the park assist does not work properly either. all was working great about 5 days ago. I'm stumped

Thnx
LinearB