Why can’t you use your laptop expansion slots?

You want to add a FireWire port to your laptop, so you’ve selected a CardBus adapter that includes multiple ports on a single expansion card. When you slide the card into your laptop, however, the card will not insert completely into the slot. What’s the most likely cause of this problem?

Problems with a PCI card installation

One of your customers has installed a new modem into their desktop computer by adding a modem adapter card into a free PCI bus adapter card slot. However, when they start Windows XP the card isn’t recognized automatically as expected and the adapter doesn’t appear in Windows Device Manager. What is the most likely cause of this problem?