one channel weird level - Win 7

When recording from stereo mix, one channel is lower level and has a weird beginning waveform - see image.
All balance controls on Realtek HD audio manager and windows mixer is middle.

Windows 7
Audacity 2.0.2
i7 processor with 32g RAM
Intel mb with Realtek HD audio

Correct the audio drivers, replace the motherboard or use an external sound card. See .


Drivers are all currently the latest version.
Any other ideas besides replacing the new motherboard?

Gale’s other suggestion was to use a external (USB) sound card.

Solution to this was to switch the speaker connection to the front audio out port.
Then a popup in Windows asked me to select that input.
Now the levels are matched.
Best I can tell is that the rear audio out port on this MB has a hardware problem.