Received this laptop in a trade ( I know sounds original) and trying to adjust fan to always on.Can boot into windows just find, but confronted with this (see pic) when I try to enter Bios Setup.I enter wrong password 3 times and this symbol shows up. Unable to view checksum.I tried hitting f12 and f2.No Luck.I just need to view checksum or hash code and I can take it from there.I read some links provided by Tito and did'nt solve my problem.
If someone has mastercode generator for it, then you're lucky, if not BIOS needs to be flashed with EEPROM burner.