Lenovo TC A51-8122, 8131, 8124, 8138, 8123 Troubleshooting and diagnostics, Basic troubleshooting

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Chapter 5. Troubleshooting and diagnostics

This chapter describes some basic troubleshooting and diagnostic tools. If your computer problem is not described here, use Access IBM for more detailed troubleshooting information or see “Additional help” on page xv.

Basic troubleshooting

Symptom	Action

The computer does not	Verify that:
start when you press the	v The power cord is plugged into the rear of the computer
power button.	and into a working electrical outlet.
	and into a working electrical outlet.
	v If your computer has a secondary power switch on the
	back of the computer, ensure that it is switched on. Check
	the power indicator on the front of the computer to ensure
	that the power is on.
	v The power supply and system board are working. See
	“Power supply and system board Diagnostic LEDs” on
	page 25
	If you cannot correct the problem, have the computer
	serviced.

The monitor screen is	Verify that:
blank.	v The monitor cable is securely attached to the rear of the
	monitor and to the rear of the computer.
	v The monitor power cord is plugged into the monitor and
	into a working electrical outlet.
	v The monitor is turned on, and the brightness and contrast
	controls are set correctly.
	v The monitor signal cable is securely connected to the
	monitor and to the monitor connector on the computer.
	v The power supply and system board are working. See
	“Power supply and system board Diagnostic LEDs” on
	page 25.
	Note: If your computer has two monitor connectors, verify
	that your monitor is connected to the one in the PCI-express
	(PCI-e) option connector rather than the one in the rear of
	the system board. See Step 4 on page 3.
	If you cannot correct the problem, have the computer
	serviced.

© Copyright Lenovo 2005. © Portions Copyright IBM Corp. 2005.

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Contents Quick Reference Page Quick Reference Page Contents Page Conditions that require immediate action Important safety informationService General safety guidelinesPower cords and power adapters Plugs and outlets Extension cords and related devicesHeat and product ventilation BatteriesCD and DVD drive safety Lithium battery notice Additional safety informationLaser compliance statement Modem safety informationPower supply statement Xiv Additional help Xvi Glare and lighting Arranging your workspaceComfort Electrical outlets and cable lengths Air circulationSetting up your computer Phone Line Setting up your computer 1394 Finishing the software installation Turning on powerCompleting important tasks Installing other operating systemsUpdating your operating system Updating your antivirus softwareRecording your computer information Starting the Setup UtilityShutting down the computer Page Creating and using product recovery discs Recovering softwareTo use Product Recovery discs, do the following Backup and recoveryTo create Product Recovery discs, do the following To perform a backup operation, do the following Using the rescue and recovery workspacePage Post-recovery notes Solving recovery problemsCreating and using a Recovery Repair diskette Creating and using rescue mediaRecovering or installing device drivers Setting a rescue device in the startup sequence Getting help and service Getting information, help, and serviceUsing the documentation and diagnostic programs Getting information Telephone numbers Calling for servicePurchasing additional services Other servicesPage Basic troubleshooting Troubleshooting and diagnosticsSymptom Action PC-Doctor for DOS Diagnostics Power supply and system board Diagnostic LEDsRunning the Diagnostics diskette Running Diagnostics from the Rescue and Recovery workspaceCreating a Diagnostics diskette Code Description Action Error codesCode Description Action Beep pattern Description Action Post beep codesPage Appendix A. IBM Lotus Software Offer European Countries U. S. Or Canada Call Latin American CountriesAsia Pacific Countries Page What this Warranty Covers Appendix B. Lenovo Statement of Limited WarrantyWhat this Warranty Does not Cover Part 1 General TermsWhat Lenovo Will Do to Correct Problems How to Obtain Warranty ServiceYour Additional Responsibilities Exchange of a Machine or PartGoverning Law Limitation of LiabilityPart 2 Country-unique Terms Peru ParaguayUruguay VenezuelaCAMBODIA, INDONESIA, and Laos Asia Pacific AustraliaCambodia and Laos India Malaysia JapanNEW Zealand PEOPLE’S Republic of China PRCEUROPE, Middle EAST, Africa Emea SingaporeGoverning Law Arbitration The following is added under this heading Consumers European Union EUFollowing paragraphs are added to this section Germany EgyptFrance Ireland HungaryUnited Kingdom Items for Which Lenovo is Not LiableSlovakia Warranty Period Part 3 Warranty InformationTypes Types Types Customer Replaceable Unit ″CRU″ Service Types of Warranty ServiceOn-site Service Courier or Depot ServiceCRU and On-site Service Customer Carry-In or Mail-In ServiceCRU and Courier or Depot Service CRU and Customer Carry-In or Mail-In ServiceCountry or Region Telephone Number Country or Region Telephone Number Country or Region Telephone Number Guarantee supplement for Mexico Page Appendix C. Customer Replacement Units CRUs HDD Appendix D. Notices Trademarks Television output noticeElectronic emissions notices European Union EMC Directive conformance statement Industry Canada Class B emission compliance statementCanadian Department of Communications certification label Power cord notice Power cord part Number Used in these countries and regions Power cord part Number Used in these countries and regions Appendix D. Notices Page Page Part Number 41D1345