Fixing the Audio Issue After the CF-30F (MK2) Windows 7 Upgrade

 After upgrading panasonic Toughbook CF-30F (MK2) to Windows 7 we have discovered a weird bug. After using Hotkey to enable/disable audio the internal speaker stopped working. We have figured out it was not driver issue. The audio was working fine through the Audio Jack. 

 Below is our solution to fix this issue. 

Step 1. 
Go to Control Panel - > Uninstall Program. Uninstall Hotkey Appendix and Hotkey Settings. Reboot the computer. If the audio problem has not been resolved go to Step 2. 

Step 2. 
Remove battery, HDD and disconnect AC adapter. Remove the bottom cover. 

Step 3. 
Disconnect 2 ribbon cables marked by green rectangle on photo below. 

Step 4. Disconnect CMOS battery for at least 1 minute. 

Step 5. Reconnect the CMOS battery. Apply a bit of CPU heat conductive grease to the processor. 

Step 6. Make sure heat conducting square is present on on the heat sink of the bottom cover and is not damaged. 

Step 7. Replace the bottom cover. Boot the computer. You should hear the system beep and message on the screen will offer to press F2 to do initial BIOS setup. When in BIOS go to "Exit" tab, load default values and press F10 to save and reboot. 

Internal speaker in Windows 7 should work now.

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