i have sony vaio model pcg-71911 it has showing this message
''The installed battery may not be properly connected to the computer or may not be compatible with the computer
click 'OK' to enter hibernate mode and remove and reinsert the battey
see the electronic VAIO(R) user guide for more information about using the battery''.
please reply if anyone knows.
I had the same problem.
It seems that there is a startup task called ISB utility. It checks to see that you are using a SONY battery. Unfortunately, the check does not always work propoerly.
The utility is not needed, and can be deactivated in the startup list.
Run msconfig and uncheck it in the startup list.