Latitude E6400 Audio problem

If you have the IDT audio driver installed for your model, you can test by switching between it and the Windows native audio driver.

1. Open the Device Manager (find it in the Control Panel, or type devmgmt.msc into the search box).
2. Expand the "Sound, video & game controllers" and right click on "IDT High Definition Audio Codec".
3. Select to "Update Driver Software".
4. Click on "Browse my computer for driver software".
5. Click "Let me pick from a list of drivers on my computer".
6. Put a check in the box "Show compatible hardware" if not already checked.
7. In the list of devices, click "High Definition Audio" (the native driver).
8. Click "Next".
9. On the Update Driver Warning box, click "Yes" (install the driver).
10. Restart the laptop if prompted. If not prompted, then no need to restart.
[To get back to the IDT driver, do it again but reverse the names in steps 2 and 7.]

If the speakers do not work with either driver then it is not a driver issue but could be failed hardware.

If the speakers work with only one of the drivers, then the other driver is at fault.

If you need more help please say which operating system is on the laptop.