This one has me stumped? On an HP ProBook 6550b, the internal speakers work fine, but not the headphone jack. This used to work fine, not sure what changed.
OS: Windows 7, 64bit
Steps I've taken:
Completely removed all audio drivers and devices from device manager.
Tried reinstalling the latest HP Drivers.
I've checked to see if any third party software might be taking control of it, but nothing stands out.