What is a expansion card for computer?

Most computers have expansion slots on the motherboard that allow you to add various types of expansion cards. These are sometimes called PCI (peripheral component interconnect) cards. You may never have to add any PCI cards because most motherboards have built-in video, sound, network, and other capabilities

Ithink you should continue to put it in the rice or try to dry it with a hair blower or go to a phone repair place so they can get as much water out as possible, these may or may not work so sorry if it doesn’t