Having problems with your HP Compaq 6720s Notebook ?

I have this problem with "power on password" on HP Compaq 6720s. Service manual: RTC battery NOTE: Removing the RTC battery and leaving it uninstalled for 5 or more minutes causes all passwords and CMOS settings to be cleared. I Removing the RTC battery and leaving it uninstalled 24 hours and outstanding problem.


Answers :

Remove accumulator too. Firstly accu then RTC battery and before this power supply. You need to put your laptop to no power for about 5-10 min
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