Unplug the system, remove the base cover and disconnect the main battery from the system board.  Hold the power button for 30 sec.  

Reassemble and try again.

@ejn63​ Thanks, will try

@ejn63​ disconnected battery but no success unfortunately   Message  “ time of day not set” “ invalid configuration information”. I reset date but not sure how to proceed. Screen back to the “No bootable devices found, with F1 F2 F5 options” Appreciate your help - new to this 

If that happens, your reserve battery is also dead.  If you can get into system setup (F2 at powerup), does it see a hard drive or SSD?

In F2 I can see settings. Under general/ system information it has memory information and Processor information. I don’t see mention of HDD or SSD

@ejn63​ thanks for trying to sssist me. finally used solution by Mansoorpataudi in 2017. Including below in case others have same problem

1. On Startup, press F12

2. Reset Bios to default settings

3. Restart laptop

4. In Bios, select Boot Sequence menu

5. Manually ADD additional line with the name "Windows Boot Manager"

6. Select /EFI/BOOT/BOOTX64.EFI

7. Exit