The 'fn'/'f7' no longer controls the brightness of the screen. is there another method to control the brightness?

Step 1:
Locate the Fn (Function) key on your keyboard. It may be on the bottom left side with dark blue letters. Locate the two "brightness" keys near the top of the keyboard. These will be in the "F" keys, possibly if F6 and F7. They should have little sun pictures or something similar to indicate brightness. Hold down the Fn key while pressing F7, or whichever "F" key your laptop uses to increase brightness. Tap F7 repeatedly until you reach the desired brightness. Fn must be held down as you continue to tap.

Locate the Fn (Function) key on your keyboard. It may be on the bottom left side with dark blue letters. Locate the two "brightness" keys near the top of the keyboard. These will be in the "F" keys, possibly if F6 and F7. They should have little sun pictures or something similar to indicate brightness. Hold down the Fn key while pressing F7, or whichever "F" key your laptop uses to increase brightness. Tap F7 repeatedly until you reach the desired brightness. Fn must be held down as you continue to tap. Hope this helps.

The blue keys serve as a secondary function for your volume control, monitor controls and pause play fast forward rewind (in media mode). In order to use the blue keys that are numbered from F1 to F12, you must depress and hold the Fn key that is located at the bottom left side of the keyboard. Here is a way to test it: Open up any file that plays sound for longer than 1 minute (60 seconds). While this file is playing, hold down the Fn key and simultaneously press F8 and listen to the volume get louder or Fn and F7 together and listen to the sound get lower. The picture of the crescent moon F1 will adjust the brightness of your screen. F2 will magnify your screen. F3 will take you to your email. F4 will take you to your internet home page. F6 will mute the volume. F7 will lower the volume. F8 will raise the volume. F9 will rewind your video playing. F10 will stop the video. F11 will pause or play the video. F12 will fast forward the video.

On most laptops, there are 2 blue-tinted pictures that may looks like light bulbs or suns located on 2 of the function keys (F1, F2, etc.) that stand for increase and decrease brightness. If you hold the "Fn" key, and start tapping the increase brightness key, the screen should turn brighter. Otherwise, you may be able to adjust screen brightness from Windows, by going to power options (control panel or right click the battery icon in the task bar) or by customizing your desktop (control panel or right click on the desktop).

1. Press down the Fn key at the lower left end of your Compaq Presario keyboard. Keep the button held down and tap the F7 key to decrease the screen brightness by one step.

2. Tap the F7 key again with the Fn key still depressed to further decrease the brightness by one step. Continue hitting the F7 key until you reach the minimum LCD screen brightness.

3. Hold down the Fn key and tap the F8 key to increase the Presario's LCD screen brightness by one step. Keep pressing the F8 key until you reach the maximum brightness for your screen

Just go to power options in control panel and click change plan settings of you current plan and move the slider right to increase brightness.Please note the left slider is for when on battery while the right slider is for when connected to AC power. Finished.I hope it helps

Brightness is controlled by a couple of the function keys along the top row of your keyboard. Compaq's support page for this model is here, where you can find manuals, drivers and other information. Hold down the Fn key and the F7 key to lower screen brightness. Fn and F8 raise the brightness. If you look at those keys, you'll see they have a little icon of a sun and up and down arrows on them.

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Decrease Brightness (fn+f7) The fn+f7 hotkey decreases the brightness of the notebook screen. The longer you hold down the fn+f7 hotkey, the more the screen dims. Decreasing screen brightness conserves power. » To increase screen brightness, press the fn+f8 hotkey.

Increase Brightness (fn+f8) The fn+f8 hotkey increases the brightness of the notebook screen. The longer you hold down the fn+f8 hotkey, the more the screen brightens. » To decrease screen brightness, press the fn+f7 hotkey.

Click Start //Click Control Panel// Performance // screen brightness

Try to set the brightness Fn+F7.
Or use the vga control panel to set it. Control Panel | Display | Setting tab | Advanced | (Vga Type) tab