If the overload is strong enough, the UPS may shut down and turn off its output power in order to protect its internal circuitry from damage. This symptom is also accompanied by a shrill constant tone. This indicator is lit whenever equipment connected to the Battery Backup outlets is drawing more power than the UPS can provide. Keep in mind that the UPS will run on battery whenever UPS deems the power is unsafe for your computer equipment. If your UPS is operating on battery power, you should save all open files and shutdown your PC and wait until normal power has been restored. The UPS can only provide power from the battery for a limited time before needing to be recharged. This indicates that your UPS is operating on battery power. The battery is not being used at this time. This indicates that the UPS is operating normally on utility power from your wall socket. Once AC power is present, to manually ""wake up"" your UPS, press the On/Test button. Depending on how the PowerChute software is configured (see PowerChute User's Guide) your ups may ""wake up"" when normal power is restored, wake up after a user-defined delay, or may not wake up at all. The UPS is put into ""sleep mode"" by the optional PowerChute shutdown software included with your Back-UPS Pro after it has performed a graceful shutdown of your operating system. This indicates that the UPS has entered ""sleep mode"" where the UPS will turn off its output power in an effort to conserve battery power. Green On Line and Red Overload LEDs: ALTERNATELY flashing This LED will remain illuminated until the unit passes a Self-Test. If it fails the test, the red Replace Battery LED will illuminate. If the Self-Test passes, the green On-Line LED will go on solid while the yellow On Battery LED will go off. This indicates that the UPS is performing a Self-Test of the battery. Green On Line LED: flashing Yellow On Battery LED: on solid The modem is preventing the computer from completing POST.Flashing LED lights on Back-UPS Pro, Back-UPS Pro USB, Back-UPS LS, and Smart-UPS SC: causes and definitionsīack-UPS Pro, Back-UPS USB, Back-UPS LS, Back-UPS CS, Back-UPS NS/XS/RS, Smart-UPS SC 620VA and underīP280X, BP420X, BP650X, BP1000, BP1100, BP1400, BK350, BK500,īR/BX SKUs, SC420, SC620, SC250RM1U, SC450RM1U The LCD encountered a problem during initialization.įigure 12: Num Lock Off, Caps Lock Flashing, Scroll Lock Flashing The USB controller encountered a problem during initialization.įigure 10: Num Lock On, Caps Lock Flashing, Scroll Lock Flashingįigure 11: Num Lock Flashing, Caps Lock On, Scroll Lock Flashing The keyboard is preventing the computer from completing POST.įigure 9: Num Lock Flashing, Caps Lock Off, Scroll Lock Flashing The video card is preventing the computer from completing POST.įigure 8: Num Lock Flashing, Caps Lock Flashing, Scroll Lock Off This code persists if no processor is detected.įigure 5: Num Lock On, Caps Lock Flashing, Scroll Lock Onįigure 6: Num Lock Flashing, Caps Lock Flashing, Scroll Lock Flashingįigure 7: Num Lock Flashing, Caps Lock Flashing, Scroll Lock On The microcontroller is handing control of the computer to the processor. The following table shows the possible LED codes that may display in a no-POST situation: Flash Codeįigure 4: Num Lock Flashing, Caps Lock On, Scroll Lock On Motherboard (Includes BIOS Corruption or ROM Error) The following table depicts the amber and white blinking patterns with possible troubleshooting resolution: LED Flash Sequence The battery LED will stop blinking for 1.5 seconds between the amber and white flashes, and the sequence will repeat after a 3 second pause. Note: The first number in the LED Flash Sequence column represents the number of amber-colored flashes, while the second number represents the number of white-colored flashes.Įxample: No Memory or RAM detected is (2,3): The battery LED blinks two times in amber, then three times in white. See the Dell knowledge base article How to Troubleshoot Dell Laptop Battery Issues to troubleshoot the battery issue.įor more info on battery warranty support, see the Dell knowledge base article Dell Laptop Battery Warranty Support.įatal battery failure with AC adapter presentīattery in full charge mode with AC adapter presentīattery in charge mode with AC adapter present.If the known-good battery works, contact Dell Technical Support for battery replacement options. Try with a known-good battery from another similar Dell laptop (if available).For laptops with non-removable battery, go to the next step. Temporary battery failure with AC adapter presentĪlternately blinking amber light with steady white light If a known-good AC adapter is working, contact Dell Technical Support for AC adapter replacement options. Disconnect and reconnect the AC adapter. An unsupported or non-Dell AC adapter is attached to your laptop.Īlternately blinking amber light and white light
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