Can't install 5.4

[Imran Sabani]

Hi,
 I'm currently using freebsd 5.2.1 and tried to upgrade to 5.4. My
problem is after i install ver_5.4 my laptop crash(hang). The keyboard
is not function anymore. FYI i'm using HP compaq nc4000 notebook. This
problem happen if i upgrade to upper version then 5.2.1. (eg, 5.3 ,
5.4). I don't have this problem if i install to ver_5.2.1. Help me to
upgrade. TQ.

Regards

Imran