PC Will Not Boot up When PCIe Card is Inserted

Updated May 17, 2019

Reported In


  • PCIe-6374
  • PCIe-1433


Motherboards: ASUS Z270H, Supermicro X11SCZ-Q, HP Z800

Issue Details

  • Why is my PC not booting after inserting my PCIe/PCI card?
  • My PCIe/PCI card worked with my old motherboard then stopped working with my new one. Is my PCIe/PCI card broken?
  • I tried placing my PCIe/PCI card in different slots and my PC still won't boot.
  • How can I determine if my PC or PCIe/PCI card is causing the issue?


Troubleshooting Steps:

1. Determine if the PCIe/PCI card is causing the issue:

  • Re-seat the PCIe Card in the PCIe Slot to see if it is recognized
  • Try the PCIe card in a different PCIe Slot on the same computer to see if it is recognized
  • Try the PCIe card in another computer to determine if the PC or card is the issue. If the card works on another computer see step 2 to check the PC settings as they may differ between computers. 
  • Try a known working PCIe card in the PCIe slot that is having the problem to confirm if the card is the problem
  • Make sure the card is in a compatible slot. For example, the PCIe-1433 is electrically a x4 card. The 1433 supports unplugging, so can be used in x4, x8 and x16 slots.  

2. If the PCIe/PCI card seems to be working correctly, check the PC:

  • Update the firmware/BIOS for the computer motherboard
  • Change BIOS settings for the PCIe card from AUTO to GEN1 (Options typically are AUTO/GEN1/GEN2/GEN3). For instructions on how to change your BIOS settings, consult your motherboard's user manual as settings may differ between devices.

Additional Information

Some motherboards may not automatically recognize the PCIe Card Version. This will cause the system to try and boot the PC with the PCIe card possibly set to the incorrect version, thus inhibiting the PC from booting up.

ASUS Z270H Motherboard:

In the case of the ASUS Z270H motherboard, it will assume all PCIe cards are V3. However, the version of the PCIe-1433 is V1.1. The PCIe needs to be manually downgraded to fix this. Go into the BIOS of the PC and find the correct setting and ensure it is set to the right version for the PCIe card.

The PCIe-1433 is electrically a x4 card.
For the ASUS Z270H Motherboard, the following slots can be used:
•    PCIe_x16/x8_1 (Electrically a x16 (x8 if PCIe_x8_2 is used)
•    PCIe_x8_2 (Electrically a x8)
Note: Leave the PCIe_x2_3 slot unused.

Supermicro X11SCZ-F/Q Motherboard:

In the case of the Supermicro X11SCZ-F/Q motherboard, the BIOS settings for the PCIe-6374 card default to AUTO. By changing the BIOS setting to GEN1, the PC was able to boot.