Hi hanksl7878,
I suggest you to install “On Screen Display” application from this link: http://dell.to/ZEtx00
The above link is for Windows 7 operating system; please install the drivers in compatibility mode. To install the drivers in compatibility mode please follow the below mentioned steps.
- Click the link above, select Download file and save the downloaded driver file on the desk top.
- From the "Start" or "Apps" Screen Right click or press and hold on a single program to check it, and click/tap on Open file location.
- Right click or press and hold on a program's shortcut (LNK), EXE, or MSI file on your desktop or in Windows Explorer, and click/tap on Properties.
- Click/tap on the Compatibility tab.
- To Run a Program in Compatibility Mode in Only your User Account, click/tap on the Run this program in compatibility mode for box to check it.
- Click/tap on the drop down menu arrow and select which version of Windows the program was written for.
- When finished, click/tab on OK to apply the changes.
Check the functionality of the buttons on the right side of the computer and try to change the brightness.
Please post the results.
