45English EnglishTroubleshootingThis chapter shows you how to deal with common system problems.Read it before calling a technician if a problem occurs. Solutions tomore serious problems require opening up the computer. Do notattempt to open the computer yourself; contact your dealer orauthorized service center for assistance.Troubleshooting tipsThis notebook computer incorporates an advanced design that deliversonscreen error message reports to help you solve problems.If the system reports an error message or an error symptom occurs, see"Error messages" below. If the problem cannot be resolved, contactyour dealer. See “Requesting service” on page 26.Error messagesIf you receive an error message, note the message and take thecorrective action. The following table lists the error messages inalphabetical order together with the recommended course of action.Error messages Corrective actionCMOS battery bad Contact your dealer or an authorized service center.CMOS checksum error Contact your dealer or an authorized service center.Disk boot failure Insert a system (bootable) disk into the floppy drive(A:), then press to reboot.Equipmentconfiguration errorPress (during POST) to enter the BIOS utility;then press Exit in the BIOS utility to reboot.Hard disk 0 error Contact your dealer or an authorized service center.Hard disk 0 extendedtype errorContact your dealer or an authorized service center.I/O parity error Contact your dealer or an authorized service center.Keyboard error or nokeyboard connectedContact your dealer or an authorized service center.