Symptoms: you need to first go inside bios and enable OSD button.  Turn on (or restart) your computer and press F2 immediately System setup options—System Configuration menu Ensure that the OSD button is enabled. Save and Exit the BIOS. [IMAGE] then you need to download and install Dell OSD application from driver site. Version 1.0.5.0, A01 File Name Dell-On-Screen-Display-Application_XM4WC_WIN_1.0.5.0_A01.EXE File size 11.73 MB Description This package contains the application for the Dell On-Screen Display (OSD). Dell On-Screen Display (OSD) allows you to control the brightness bar, change the input source, and turn the screen on or off through the OSD button.
Hi all, I've searching numerous websites for how to adjust the brightness on my all in one Inspiron 7700 and have been unsuccessful. I've tried the following: As a last resort, I'm submitting inquiry here for help.  Thanks, Ken 
Inspiron 7700 AIO - Adjust Brightness