Dell OptiPlex 5060 Tower Service Manual - Page 73

8. Shut down the computer. 9. Press and hold the Fn key, while pressing the power button, and then release both. 10. Repeat steps 3-7 above. Power-Supply Unit Built-in Self-Test Built-in Self-Test (BIST) helps determine if the power-supply unit is working. To run self-test diagnostics on the power-supply unit of a desktop or all-in-one computer, see the knowledge base article 000125179 at www.dell.com/support. Diagnostics The computer POST (Power On Self Test) ensures that it meets the basic computer requirements and the hardware is working appropriately before the boot process begins. If the computer passes the POST, the computer continues to start in a normal mode. However, if the computer fails the POST, the computer emits a series of LED codes during the start-up. The system LED is integrated on the Power button. The following table shows different light patterns and what they indicate. Table 3. Power LED summary Amber LED state Off White LED state Off System state S5 Notes Off Blinking S3, no PWRGD_PS Previous State Previous State S3, no PWRGD_PS This entry provides for the possibility of a delay from SLP_S3# active to PWRGD_PS inactive. Blinking Off S0, no PWRGD_PS Steady Off S0, no PWRGD_PS, Code fetch = 0 Off Steady S0, no PWRGD_PS, Code This indicates that the host fetch = 1 BIOS has started to execute and the LED register is now writable. Table 4. Amber LED blinking failures Amber LED state White LED state 2 1 2 2 2 3 2 4 System state Bad MBD Bad MB, PSU or cabling Bad MBD, DIMMS, or CPU Bad coin cell Notes Bad MBD - Rows A, G, H, and J from table 12.4 of SIO Spec - Pre-Post indicators [40] Bad MBD, PSU or PSU cabling - Rows B, C and D of table 12.4 SIO spec [40] Bad MBD, DIMMS or CPU Rows F and K from table 12.4 of SIO spec [40] Bad coin cell - Row M of table 12.4 in SIO spec [40] Troubleshooting 73