problem with network card

[mike]

I have a box with  sis900 onboard eth which has worked fine with all
previous versions of RH/fedora

Now with test3 the network just wont come up

details

modprobe sis900 works fine with no errors and and lsmod shows the module
loaded

the only error I can see is via dmesg which is to me a very wierd

eth0:Can not find ISA Bridge

lspci shows the card present as well

So any ideas? - I am getting well and truly stumped.