Harddisk problem.

[disappearedng]

Hi everyone.
I have a Asus barebone motherboard with a Western Digital 500 GB SATA harddisk which serves as the only hdd on my system.

I installed FreeBSD, everything seems ok.

But ever since I rebooted (I disable acpi permanetly; I have even tried this with acpi enabled), I am getting the following error on my screen

ad8: 976773168 sectors 16 sectors/ interrupt 1 depth queue
ad8: intel check1 failed
ad8: adaptec check1 failed
ad8: LSI (v3) check1 failed
ad8: LSI (v2) check1 failed
ad8: FreeBSD check1 failed
GEOM: new disk ad8
GEOM_Label: label for provide ad8s1 is ntfs/new volume.

Then the system just hangs.
I have rebooted into single user mode, ran fsck -f and nothing seems particularly wrong. What could be the reason for my system to crash during boot time?

Any help will be appreciated.