Lenovo ThinkCentre M51e (English, Danish, Norwegian, Finnish, Swedish) Quick r - Page 49
Diagnostics, Doctor
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LED Diagnostics Some machine types have two LEDs located on power supply on the back of your computer. 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. The following table gives the LED diagnostics. 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 Dos Diagnostics The PC Doctor 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 using the Product Recovery program on your hard disk. Alternatively, you can create bootable diagnostics diskettes from the Product Recovery program. You can also download the latest version of the diagnostics program from http://www.ibm.com/pc/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