HP 285 Maintenance and Service Guide - Page 85
Mouse will only move vertically, horizontally, or movement is jerky., Cursor will not move using
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Cursor will not move using the arrow keys on the keypad. Cause The Num Lock key is on. Solution Press the Num Lock key. The Num Lock light should be off if you want to use the arrow keys on the keypad. You can disable or enable the Num Lock key in Computer Setup at Advanced > Device Options. Mouse does not respond to movement or is too slow. Cause Mouse connector is not properly plugged into the back of the computer. Program in use has stopped responding to commands. Mouse may need cleaning. Mouse may need repair. Computer is in Sleep state. Solution Shut down the computer using the keyboard. Windows 7: 1. Press the Ctrl and Esc keys at the same time (or press the Windows logo key) to display the Start menu. 2. Use the arrow keys to select Shut Down and then press Enter. 3. After the shutdown is complete, plug the mouse connector into the back of the computer (or the keyboard) and restart. Windows 10: 1. Press the Ctrl and Esc keys at the same time (or press the Windows logo key) to display the Start menu. 2. Use the arrow keys to scroll to and select the power icon at the top right on the menu, and then press Enter. 3. Use the arrow keys to select Shut Down, and then press Enter. 4. After the shutdown is complete, plug the mouse connector into the back of the computer (or the keyboard) and restart. Shut down the computer using the keyboard then restart the computer. Remove the roller ball cover on the mouse and clean the internal components. See the Worldwide Limited Warranty for terms and conditions. Press the power button to resume from Sleep state. CAUTION: When attempting to resume from Sleep state, do not hold down the power button for more than four seconds. Otherwise, the computer will shut down and you will lose any unsaved data. Mouse will only move vertically, horizontally, or movement is jerky. Cause Solution Mouse roller ball or the rotating encoder shafts that make contact Remove roller ball cover from the bottom of the mouse and clean with the ball are dirty. the internal components with a mouse cleaning kit available from most computer stores. Solving keyboard and mouse problems 77