System Locks after RH7.2 install

[Art Ross <aross skyenet net>]

I'm having trouble on my system that has successfully operated RH6.2.
When I placed a new removable HD in my system and installed RH7.2, I
wasn't able to reboot without locking up.  Not being discouraged, I
tried again.  Same problem!  Still not being discouraged, I installed
Mandrake 8.1 which also uses the 2.4.x kernel.  Same effect!

Are my problems with the newer kernel?  If so, where should I start to
look.   I've reviewed documentation which states my AMD K6-2 300 MHz
processor and my MicroStar 5165 MB are compatible.  What is going on?

Thanks in advance,
 Art