wake on lan for Compaq 6000

Hi,

Just bought a second hand HP Compaq 6000 Pro SFF PC

My problem is simple, Power On LAN works if the machine is in Sleep mode but not if Powered Off.

Yes the network LED is lit, but the motherboard is still as built, so the BIOS needs updating.

But before I do this, I would like to know if this is the problem or will a second network card

solve my problem?

Thanks.

Richard Gamester