Dell OptiPlex 755 User's Guide - Page 336

I N S E R T B O O T A B L E M E D I A - Insert a bootable floppy disk, CD, or DVD. N O N - SYS T EM D I S K ER R O R - Remove the floppy disk from the floppy drive and restart your computer. N O T E N O U G H M E M O R Y O R R E S O U R C E S . C L O S E S O M E P R O G R A M S A N D T R Y A G A I N - Close all windows and open the program that you want to use. In some cases, you may have to restart your computer to restore computer resources. If so, run the program that you want to use first. O P E R A T I N G S YS T E M N O T F O U N D - Contact Dell (see "Contacting Dell" on page 370). 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 - • Ensure that the keyboard cable is firmly connected to the computer. • Shut down the computer (see "Before Working Inside Your Computer" on page 21), reconnect the keyboard cable as shown on the setup diagram for your computer, and then restart the computer. • Ensure that the cable is not damaged or frayed and check cable connectors for bent or broken pins. Straighten any bent pins. • Remove any keyboard extension cables and connect the keyboard directly to the computer. TE ST T H E KE Y BOA RD - Connect a properly working keyboard to the computer, then try using the keyboard. R U N TH E H A R D W A R E TR O U B L E S H O O T E R - See "Troubleshooting Software and Hardware Problems in the Microsoft® Windows® XP and Microsoft Windows Vista® Operating Systems" on page 358. 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 C H E C K T H E D I A G N O S T I C L I G H T S - See "Diagnostic Lights" on page 347. ENSURE THAT THE POWER CABLE IS FIRMLY CONNECTED TO THE COMPUTER AND TO THE ELECTRICAL OUTLET The computer stops responding NOTICE: You may lose data if you are unable to perform an operating system shutdown. TU R N T H E C O M PU TE R O F F - 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), and then restart your computer. A program stops responding END THE PROGRAM - 1 Press simultaneously to access the Task Manager. 2 Click the Applications tab. 336 Solving Problems