FreeBSD supports APM on certain machines. Further information can be found in apm(4).
FreeBSD also supports the ACPI features found in most modern hardware. Further information can be found in acpi(4). If a system supports both APM and ACPI, either can be used. We suggest you try both and choose the one that best fits your needs.
Add following line
hint.acpi.0.disabled="1"into your /boot/device.hints file.
Certain Micron motherboards have a non-conforming PCI BIOS implementation that causes grief when FreeBSD boots because PCI devices do not get configured at their reported addresses.
Disable the “Plug and Play Operating System” flag in the BIOS to work around this problem.
Go into the BIOS setup and disable the “boot virus protection”.
See the previous answer.