Quick Reference Guide 45T E S T T H E K E Y B O A R D — Connect a properly working keyboard to the computer, thentry using the keyboard.R U N T H E H A R D W A R E T R O U B L E S H O O T E R — See "Restoring Your Operating System"in your User’s Guide.Lockups and Software ProblemsCAUTION: Before you begin any of the procedures in this section, follow thesafety instructions in theProduct Information Guide.The computer does not start upC H E C K T H E D I A G N O S T I C L I G H T S — See "Power Lights" on page 27.E N 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 OT H E E L E C T R I C A L O U T L E TThe computer stops respondingNOTICE: You may lose data if you are unable to perform an operating system shutdown.T U 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 onyour keyboard or moving your mouse, press and hold the power button for at least8 to 10 seconds (until the computer turns off), and then restart your computer.A program stops respondingE N D T H E P R O G R A M —1 Press simultaneously to access the Task Manager.2 Click the Applications tab.3 Click to select the program that is no longer responding.4 Click End Task.A program crashes repeatedlyNOTE: Most software includes installation instructions in its documentation or ona floppy disk, CD, or DVD.C H E C K T H E S O F T W A R E D O C U M E N T A T I O N — If necessary, uninstall and then reinstallthe program.