WHy is it that I always need to switch PCI cards to different slots to get them to all work properly at the same time? I've especially had to do this once I got my TV tuner card. Granted, I do have a lot of devices - Matrox G550 AGP Video card, and all the rest are PCI: SoundBlaster Live! (original), Linksys 10/100 NIC, Lucent 56K Winmodem, SiS USB 2.0/Firewire card, Winfast XP Tv tuner. But generally speaking, why is it that some devices work only in certain slots or in a certain order?