Solving Problems 39Keyboard ProblemsCAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in theProduct Information Guide.Lockups and Software ProblemsCAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in theProduct Information Guide.The computer does not start upThe computer stops respondingNOTICE: You may lose data if you are unable to perform an operating system shutdown.CH E C K T H E K E Y B O A R D C A B L E —• Ensure that the keyboard cable is firmly connected to the computer.• Reconnect the keyboard cable as shown on the setup diagram for your 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 S T T H E K E Y B O A R D — Connect a properly working keyboard to the computer, then try using thekeyboard.RU N T H E HA R D W A R E TR O U B L E S H O O T E R — See "Resolving Software and Hardware Incompatibilities"on page 56.CH E C K T H E DI A G N O S T I C LI G H T S — See "Diagnostic Lights" on page 49.EN S U R E T H A T T H E P O W E R C A B L E I S F I R M L Y C O N N E C T E D T O T H E C O M P U T E R A N D T O T H E E L E C T R I C A LO U T L E TTU R N T H E C O M P U T E R O F F — If you are unable to get a response by pressing a key on your keyboard ormoving your mouse, press and hold the power button for at least 8 to 10 seconds, until the computerturns off, and then restart your computer.