Hi team... My Lenovo laptop l480 thinpad not powering on

Hi @yongamazibi

Try a full power refresh in case the BIOS has been corrupted for whatever reason and check if that resolves the problem.

• Disconnect the charger (if connected)
• Open the laptop, disconnect the main battery cable from the motherboard and then disconnect and remove coin cell RTC battery from the motherboard.

Here's the hardware maintenance manual for the laptop that will help. Go to the bottom of p.75 (81 of 112 pdf) and p.77 (83 of 112 pdf) of the manual, to view the procedure to disconnect the main battery cable and to remove the RTC coin cell battery, respectively.

Note: Once the RTC coin cell battery is out, measure its voltage. If it is <2.5V DC or if the battery is >4-5 years old, replace it. If it needs replacing, search online for 02K7078 to find battery suppliers that suit you best.

• Press and hold the laptop's power button for a full 30 seconds and then release it.
• Reconnect and reinsert the RTC coin cell battery on the motherboard, reconnect the main battery cable, reassemble the laptop, reconnect the charger and check if it turns on OK etc.

If it does there may be a message stating that the date and time are incorrect. This is normal as the BIOS has been reset back to its factory default condition by the above procedure. Once the date and time have been corrected, the message won't appear the next time that the laptop is started. If there were any user definable BIOS settings changed by you to suit whatever operating requirements you needed, they will have to be changed back again also.