cannot detect NIC card on dell vostro 1500

i installed solaris 5.10 on dell vostro 1500...but it does not detect interface card....i need to pratice networking concepts ............please help me in this regard...

you need to make sure that your NIC is supported by latest solaris release
check out SUN HCL
or
download SUN HW detection tool run it and see results
maybe you will find a clue on how to fix your problem