acpi strange problems

[Andrew]

If i enable acpi in bios, set in Advanced Bios setup 'apic mode enable', 
and booting freebsd with acpi enable (default boot) freebsd5.2rc have
stop booting (if verbose loading enabled, last message is 'starting 
/sbin/init'). Scroll lock and ctrl-alt-esc work correctly. Ctrl-alt-del 
and power button have no any effect.
about system: soltek frn2(nforce2 ultra400)/athlon xp2500+/gf4ti4200.
Unfortunetly, now i haven't time to debug kernel, so i can only report 
about this.
ps. sorry, my english isn't very good (last times i have very some time to 
sleep too)
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