Dell Precision 490 Desktop User's Guide - Page 158

Keyboard Problems CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. Check the keyboard cable - l Ensure that the keyboard cable is firmly connected to the computer. l Shut down your computer (see Turning Off Your Computer), reconnect the keyboard cable as shown in the Quick Reference Guide for your computer, and then restart the computer. l Check the cable connector for bent or broken pins and for damaged or frayed cables. Straighten bent pins. l Remove keyboard extension cables and connect the keyboard directly to the computer. Test the keyboard - Connect a properly working keyboard to the computer, and try using the keyboard. If the new keyboard works, the original keyboard is faulty. Check for Software and Hardware Conflicts - See Software and Hardware Incompatibilities. Lockups and Software Problems CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide. The computer does not start up Check the Diagnostic Lights - See Diagnostic Lights. Ensure that the power cable is firmly connected to the computer and to the electrical outlet The computer stops responding NOTICE: You might lose data if you are unable to perform an operating system shutdown. Turn the computer off - If you are unable to get a response by pressing a key on your keyboard or moving your mouse, press and hold the power button for at least 8 to 10 seconds until the computer turns off. Then restart your computer. A program stops responding End the program - 1. Press simultaneously. 2. Click Applications. 3. Click the program that is no longer responding. 4. Click End Task. A program crashes repeatedly NOTE: Software usually includes installation instructions in its documentation or on a floppy disk or CD.