Here are steps to troubleshoot and address the problem:
Ensure Proper Installation:Confirm that the graphics card is correctly seated in the PCI Express slot on your motherboard. Ensure all power connectors are securely connected.
Check Power Supply:Graphics cards often require additional power.
Update Drivers:Outdated or incompatible graphics card drivers can cause recognition issues.
BIOS/UEFI Settings:Access your computer's BIOS/UEFI settings during startup and check if the PCI Express slot is enabled. Some motherboards may allow you to select the primary graphics adapter.
Check Compatibility:Ensure that your graphics card is compatible with your motherboard. Some older motherboards may not support newer graphics cards, especially if they use different PCI Express versions.
Try Another PCIe Slot:This can help determine if the issue is with the slot itself.
Test with Another System:If possible, test the graphics card in another computer to see if it is recognized. This can help identify whether the issue lies with the graphics card or the computer's components.
Check for Physical Damage:Inspect the graphics card for any signs of physical damage. Damaged connectors or components could prevent proper recognition.
Windows Device Manager:Open Device Manager in Windows and check for any unknown or conflicting devices. Update drivers or resolve conflicts if needed.

Reinstall Graphics Card Drivers:The current graphics card drivers uninstall, your computer restart, and then the latest drivers reinstall from the website.
Reset CMOS/BIOS:Resetting the CMOS/BIOS settings to default may help if there are configuration issues.
Read also: How to fix a slow boot time on my desktop