Created on: May 4, 2013
Last updated: August 24, 2015
The most common cause of PCIe-related problems is that the card is either not fully seated or installed properly, or it is not installed in the optimal slot based on the amount of bandwidth it requires. In some cases a special driver may be required (please check your documentation – typically drivers are available on the product web page, under "Specs").
First, try the following steps to eliminate the possibility that the card is not seated properly.
1. Save all work and shut down the computer.
2. Disconnect power from the computer.
3. Disconnect any powered devices from the computer, and all devices that may be connected to your PCIe card.
4. Open the computer, then remove the card carefully according to the user guide.
5. Reseat the card in its original slot, according to the user guide. You should be able to press the card fully into the slot with only a modest amount of even pressure, across the top of the card. Do not force the card if it's not seating fully!
6. Close the computer, reconnect your power and any devices being used with this PCIe card.
7. Restart the computer. Afterward see if the card is recognized and/or if the device(s) connected to it are recognized.
If this doesn't work, repeat the above steps, except this time, try installing the card into a different slot. Typically the slot next to the Graphics card is the optimal slot, but you need to check your Apple documentation to be sure how the PCIe slots are configured. If you're still having trouble please contact Technical Support.