Lenovo 8124, 8131 Power supply and system board Diagnostic LEDs, PC-Doctor for DOS Diagnostics

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Power supply and system board Diagnostic LEDs

You computer has two LEDs located on power supply on the back of the chassis. The power button LED located on front of your computer and the two LEDs on the back will help you determine if the power supply or system board is working correctly. The following table uses the LEDs to diagnose possible power supply and system board problems.

Power Button
LED	Green LED	Yellow LED	Diagnosis

Off	Off	Off	Check the following first:
			v Is power cord plugged in?
			v Is the power strip on?
			Failing power supply

Off (After	On	Off	Failing system board
pressing the
power
button)

On	On	On	Failing power supply

On	On	Off	Normal working conditions, but if your
			computer is not working correctly then you
			have a failing system board or a failing
			microprocessor

If you cannot correct the problem, have your computer serviced.

Note: To reset the computer once a yellow LED is on, unplug the power cord.

PC-Doctor for DOS Diagnostics

The PC-Doctor for DOS Diagnostics program runs independently of the operating system. You can use this program to test hardware components of your computer. You can use this program when other methods are not available or have not been successful in isolating a possible hardware problem.

You can run the diagnostics from the Rescue and Recovery workspace on your hard disk. Alternatively, you can create bootable diagnostics diskettes from the Rescue and Recovery workspace.

You can also download the latest version of the diagnostics program from http://www.lenovo.com/think/support/ on the World Wide Web. Type your machine type and model number into the Quick Path field to find the downloadable files that are specific to your computer.

Chapter 5. Troubleshooting and diagnostics

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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 Comfort Arranging your workspaceGlare and lighting Electrical outlets and cable lengths Air circulationSetting up your computer Phone Line Setting up your computer 1394 Finishing the software installation Turning on powerUpdating your antivirus software Installing other operating systemsCompleting important tasks Updating your operating systemShutting down the computer Starting the Setup UtilityRecording your computer information Page Creating and using product recovery discs Recovering softwareTo create Product Recovery discs, do the following Backup and recoveryTo use 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 information Getting information, help, and serviceGetting help and service Using the documentation and diagnostic programsTelephone 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 LEDsCreating a Diagnostics diskette Running Diagnostics from the Rescue and Recovery workspaceRunning the 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 Part 1 General Terms Appendix B. Lenovo Statement of Limited WarrantyWhat this Warranty Covers What this Warranty Does not CoverWhat 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 Venezuela ParaguayPeru UruguayCambodia and Laos Asia Pacific AustraliaCAMBODIA, INDONESIA, and Laos India PEOPLE’S Republic of China PRC JapanMalaysia NEW ZealandEUROPE, Middle EAST, Africa Emea SingaporeGoverning Law Arbitration The following is added under this heading Consumers European Union EUFollowing paragraphs are added to this section France EgyptGermany Ireland HungarySlovakia Items for Which Lenovo is Not LiableUnited Kingdom Warranty Period Part 3 Warranty InformationTypes Types Types Courier or Depot Service Types of Warranty ServiceCustomer Replaceable Unit ″CRU″ Service On-site ServiceCRU and Customer Carry-In or Mail-In Service Customer Carry-In or Mail-In ServiceCRU and On-site Service CRU and Courier or Depot 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