Thanks Tim. Just got of the phone with TAC. They find it strange also that LDAP Broswer was able to see the computer account and Clearpass could not. Aftward, TAC performed the following within Clearpass.
Configuration >> Authentication >> Source >> "Your AD Server" then click the Atrribute tab. Next, Click anywhere in the body to open up the Configuration Filter settting.
Under "Fiter Query", TAC removed the default string of "(&(&(sAMAccountName=%{Authentication:Username})(objectClass=user)))" and save it. Finally, TAC pasted back the default string and save it.
Afterward, Clearpass was able to see the computer and the computer was able to authenicate sucessfully via computer authenication.
Thnx.
Chan K.