PCI slots are a vital part of the computer system and should be checked regularly to ensure that they are functioning properly. The easiest way to check PCI slots is to open the computer case and look for the PCI slots. If the PCI slots are not visible, then they may need to be accessed through a motherboard or by removing a card from the computer. If the PCI slots are visible, then they can be checked for proper function by inserting a card into each slot and verifying that the computer is able to properly recognize and use that card.
Finally, it is important to make sure that the PCI slot covers are closed properly and not damaged. If any of these checks indicate that the PCI slot needs to be replaced or repaired, then that should be done as soon as possible.