'No Audio Output device is installed' Problem

[DisposableSaint]

Recently I've come across the problem of having no audio on my HP Pavilion dv9700 Notebook PC, it simply tells me that 'No Audio Output device is installed'. I upgraded my computer from Vista to 7 and for 5 months had no problems. I've tried to install things such a Realtek and also tried to Scan for Hardware Changes and Update driver software, but nothing has worked. Also, in my device manager, under Other Devices there are 3 yellow signs with exclamation marks in front of 'Coprocessor' and also in front of two 'pcouffin' devices, I have no idea whether these are the roots of the problem or not. Is there any way that I can fix this problem?http://h30434.www3.hp.com/psg/board...&thread.id=1278&view=by_date_ascending&page=2

 

[TVeblen]

Welcome to the Forum.

Problem devices can cause a range of problems. You need to address them.

Take a read of this:
http://www.sevenforums.com/drivers/52275-coprocessor-driver-required.html

And This:
Pcouffin.sys Windows process - What is it?

And see if helps.