Dell Latitude screen will not adjust for brightness

Function Keys 'Fn'. One is Function Brighter + and one Darker -

How do I adjust the brightness on my Dell Latitude laptop?
You can press the following keys to adjust display brightness: Press and the up-arrow key to increase brightness on the integrated display only (not on an external monitor). Press and the down-arrow key to decrease brightness on the integrated display only (not on an external monitor).

Using the Display: Dell Latitude D630/D630c User's Guide

http://www.solano.edu/technology100218/data/D630/display.htm#:~:text=You%20can%20press%20the%20following,not%20on%20an%20external%20monitor).

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I believe it is an added feauture

When you get access, go into power options, select hibernate top right, and uncheck the box to the left to disable it, this will free up more disc space and get rid of microsoft worst idea.

The dell D520 doesn't have any switch to power off the wireless. You will have to use the hot-key method. Just press Fn+F2. If you have curiosity:
In computing, a keyboard shortcut is a finite set of one or more keys that invoke a software or operating system operation when triggered by the user.

Look for a key labeled "Fn" (blue lettering) on the lower left side of the keyboard

Hold the "Fn" key and then use the Up/Down arrows to adjust brightness.

If that doesn't work, reboot your laptop and get into the BIOS. There is a screen for brightness. I don't recall how it is labeled, but it's one of the last pages as you cycle through the BIOS options.

Hold the Fn key and press the up arrow.

Hello,
Reinstall the wifi drivers and also check if you are facing the same problem the wired connection also..
Thanks

it sounds like you did the right thing, i would search google for "Dell D520 keyboard", you should find many places at different prices, if you havent bought from the site before, try reading some customer feedback, and also, the cheapest may not be the best, look for a good return policy and or warranty for the item. if this helps pleas give a fixya rating thanks

Laptops are provided with a combination key that can increase and decrease brightness. Find on your keyboard 2 keys with a bulb and an arrow key. Mostly you'll have something like a sun. Hold down your FN key (near your left ctrl key) and press one of those keys depending on whether you want to increase or decrease brightness. In Dell the keys will the arrows keys themselves

If you keyboard isn't working and this is the correct one, I would buy it and replace it. I have done this before on a Dell Latitude CPI. Easy to do. Good luck.