my machine freezes if I reset it

[Alfonso Romero]

When I use the "shutdown -r now" command, my freebsd 4.8 machine starts the
rebooting process, but freezes when detecting the "pci0" device: an ATI Mach
64 Accelerator card. If I shutdown the machine and then turn off the power,
when I turn it on again there isn´t any problem: FreeBSD goes through the
boot process without any trouble. What could be causing this?



Thanks in advance,

Alfonso Romero