Lenovo ThinkCentre M50e Quick Reference Guide - Page 43
Power, Supply, System, board, Diagnostic, PC-Doctor, 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? Off (After On Off pressing the power button) On On On On On Off Failing power supply Failing system board Failing power supply 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 Product 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 25