How can a PCI modem keep a system from booting? I got to the point in assembling a new system to put the modem from my old PC in, and when I try to power up with the modem in, I get nothing. All drives spin up, but I get nothing. No drive checks, can't get to the BIOS, the hard drive isn't accessed at all. If I power down, pull the modem and power back up, it boots with no problem. What's the deal here?