I want to make a small home network. I have a PC with a PCI network card. And the other has two 3com network cards. their model Fast Etherlink ISA 10/100 Base-TX 3C515-TX. when I insert them into the old PC, install them, configure the connection to my ISP trafic lamp blinks but no data is being transfered. When I insert PCI card and configure it the same way it work perfectly. Those ISA cards were removed from working PC's. What could be wrong?