Cannot detect GPU before load into Windows

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   When I power on or restart the system, the BIOS has 5 long beeps, monitor display nothing (neither Asrock logo non loading spinner) until it show Windows login screen. Checked the device manager the GPU driver is there. 

If unplug the GPU and connect monitor to onboard HDMI, the system will startup normally without beep. 

The long 5 beeps is warning of missing graphic card. Primary GPU in BIOS is set to Auto. The GPU has been tested on old system is working fine. 

My system spec as below:
Asrock B560M Pro4
Intel Core i5-11400
Team 16GB DDR4-3200 RAM
Galax GTX1070 8GB GPU

May I know what is the cause, or any driver will cause the BIOS failed to detect the GPU? But still able to show display after Windows load? 

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wwkiong Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 17 Nov 2021 Status: Offline Points: 20	Post Options Post Reply Quote wwkiong Report Post Thanks(0) Quote Reply Topic: Cannot detect GPU before load into Windows Posted: 17 Nov 2021 at 9:26pm
	When I power on or restart the system, the BIOS has 5 long beeps, monitor display nothing (neither Asrock logo non loading spinner) until it show Windows login screen. Checked the device manager the GPU driver is there. If unplug the GPU and connect monitor to onboard HDMI, the system will startup normally without beep. The long 5 beeps is warning of missing graphic card. Primary GPU in BIOS is set to Auto. The GPU has been tested on old system is working fine. My system spec as below: Asrock B560M Pro4 Intel Core i5-11400 Team 16GB DDR4-3200 RAM Galax GTX1070 8GB GPU May I know what is the cause, or any driver will cause the BIOS failed to detect the GPU? But still able to show display after Windows load?