Headphone Jack Not Working After Windows 7 Install

After my desktop with XP crashed, I recovered along with a clean install of Windows 7. The processor is an Intel Core 2 Duo with the onboard audio device showing Microsoft as the manufacturer. The front headphone port worked for about a week after the recovery, then just stopped. Moving the headphone jack to the rear port continues to work fine. I plugged the speaker jack in the front port and there is no sound, same as the headphones.

To troubleshoot I've tried the "Update Driver" and MS says I'm using the most up-to-date driver. Where you view what devices are recognized by the sound system it displays a speaker icon, but there is no option to add headphones. The desktop is a custom-built one (not an HP, Dell or Lenovo, for example). I don't know if this audio problem is a hardware failure or related to the Windows 7 install.