SMP kernel, only single processor appears

Hi,

I have an Intel 7505VB2 dual Xeon motherboard with 2x2.66GHz CPUs, Redhat
9.0 and self-compiled 2.4.23 kernel. Interestingly, I see only one CPU
with e.g. "top", or cat /proc/cpuinfo, etc.

I have to tell though that I installed this system by cloning the disk of
another PC, which is running a single processor; then booting in the dual
processor computer from the cloned disk (with a bootfloppy), and then
recompiling the kernel (and rebooting to the new SMP enabled kernel).
Seems to me that this is not enough, and I might have missed something.

Any advice would be welcome.

Thanks
Gaspar