From John Ohl:
With Dell Diagnostics you can lookup diagnostic LED's and beep codes for Dell systems. Fast Beep, Slow Beep, Numbered and Lettered Quad Pack lights and Laptop Lock Lights can all be looked up with this application, without requiring an internet connection.
This application is simply a reference, it is not created by or endorsed by Dell, all the information provided herein is free information that can also be found on http://support.dell.com.
What's new in this version:
Fixed the app icon for most iPhone / iPod firmware versions