Check Physical Connection:

Ensure GPU power cables are connected securely. Modern GPUs need 6-pin or 8-pin power connectors. Check card is seated properly in PCIe slot.

Update or Reinstall Drivers:

Use DDU (Display Driver Uninstaller) for clean removal. Install latest drivers fresh. Solves most software-related GPU issues.

Check Device Manager:

Does GPU appear? Is there a warning symbol? Update driver or disable/enable the device. Missing GPU indicates hardware issue.

BIOS Settings:

Ensure Primary Display is set to PCIe. Some boards need manual GPU enabling. Check motherboard documentation.

Monitor Temperature:

Overheating causes throttling and crashes. Use HWiNFO to monitor temps. Clean fan and consider repasting thermal compound.

Stress Test:

Run FurMark to test stability. Crashes indicate hardware problems. Compare benchmarks to expected performance.

Conclusion:

DDU with clean driver installation resolves most issues. Physical problems require inspection or replacement.