Sun Microsystems 220R manual

If a Sun Type-5 keyboard is attached to the system, POST status and error indications are also displayed via the four LEDs on the keyboard. When POST starts, all four keyboard LEDs blink on and off simultaneously. After that, the Caps Lock LED blinks slowly to indicate POST is running. If an error is detected, the pattern of the lit LEDs provides an error indication. See “Error Indications” on page 138 for more information.

If POST detects an error condition that prevents the system from booting, it will halt operation and display the ok prompt. The last message displayed by POST prior to the ok prompt indicates which part you need to replace.

Chapter 7 Diagnostics and Troubleshooting 125