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The 3rd led it is light when pressed Scroll Lock key on keyboard, now it is not more used but in Windows and programs but it is still constructed on keyboard as a standard.
On construction this key was used in correlation with Ctrl key -system properties, and also when it is press the arrows works a page-up or page-down.
But now it is more common to use the wheel from mouse to scroll down or up a page. ;-)
Actually you hit a combination of keys. Most likely you hit Ctrl+Alt and an arrow key. Try Ctrl+Alt+the up arrow. If that rotates the screen to upside down, repeat the combination twice more (or use Ctrl+Alt+the down arrow twice).
If that doesn't work, if you have a Windows OS, try the Screen Resolution or Graphics Display settings. Right click on the desktop anyplace with no running programs or icons, select Screen Resolution and then change the drop down for Orientation. This works on my desktops. For my laptop, it's the Graphic Display and then a similar orientation label.
(FuNction key) A keyboard key that works like a shift key to activate a second function on a dual-purpose key. Commonly found on laptop keyboards, the Fn key is often used to control hardware functions such as screen brightness and speaker volume. The Fn key may also be found on extra small keyboards for desktop computers, typically for Page Up and Page Down, which are combined with Up Arrow and Down Arrow. See function key.
It's possible the ZIF Cable for the touchpad has come loose. You can access it fairly easy.
Follow this link, at the bottom of the page there will be a link that reads "download" Dell service manual. Click the word "Download" and you will get a pdf repair manual. Hope it helps If this helps you resolve your problem, please consider giving me a rating of 4 and maybe a "thanks" It will help me as well. Thank you.
Two different ways to do it...
1. Use your function keys... Combination of the Fn key (next to the Alt Key) and one of your "F" keys, look on your F-Keys you will see icons.. Look for the Touchpad Icon
Then Press Fn and Corresponding F Key at the same time to Enable/Disable Touchpad...
Go to Dell.com scroll to bottom of website's home page and look for: SUPPORT AND DRIVERS.... Click on the Text and It Will Then Ask You To CHoose ... LAPTOP, or Desktop, or Tablet etc.... You Choose LAPTOP..... THen Choose THe Model from the list, then choose the model number from the list and it will then take you to Your Laptops Drivers Page... Scroll Down and Find Your Touchpad Driver and Redownload it and install it....
I used to get this problem. It is VERY annoying as you must know. try pushing the windows icon button in the top right corner of your keyboard(thats where it is on my keyboard)then use your arrow keys to scroll up to control panel, select mouse by using arrow keys and then use the tab and arrow keys to open the mouse keypad pagetab and push enable and enter key to turn it on.
IF WHEN YOU DO THAT AND your in the touchpad properties but there is no 'enable' and it says no hardware detected, then go into the same mouse window from the control panel and go to the hardware tab and either try to update driver or use the trouble shoot button.
you may have turned on click-lock. You can disable this feature in Control Panel, under Accessibility Options. Click Lock helps people who have a hard time holding the mouse button while dragging the mouse across the screen by holding the mouse button for them