This laptop mother board does not have the usual CMOS/RTC coin cell battery. Apparently the settings (BIOS/UEFI) are maintained by the laptop battery itself. When I disconnected the laptop battery, the date/time reverts to the original factory date/time. HOWEVER .. there is a cable that contains the LCD connector, the SATA HDD connector based on that some indicate it is a “CMOS cable” which in all the years I’ve been working on computers, have never heard of. That is the same with all MacBook Pro laptops - no CMOS battery — it uses the laptop battery and NOT a CMOS coin cell battery.

Computer Will not power on :

1) Faulty power button or power button board, or bad flex cable

2) DEAD motherboard

3) DEAD or BAD RAM