Acer Aspire 7540 Service Guide
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... page 86. see "Keyboard or Auxiliary Input Device Check" on page 86. Unlock key switch Monitor type does not match CMOS - Check the drive is dead - Default configuration used System timer error Real time clock error Previous boot incomplete - RTC battery Run BIOS Setup Utility to reconfigure system time, then reboot...
... page 86. see "Keyboard or Auxiliary Input Device Check" on page 86. Unlock key switch Monitor type does not match CMOS - Check the drive is dead - Default configuration used System timer error Real time clock error Previous boot incomplete - RTC battery Run BIOS Setup Utility to reconfigure system time, then reboot...