generally speaking, solid blue LOGO with continous beeps is caused by unstable connection or poorquality USB communication with peripherals plugged into Cross Hair.
you may try the following solutions:
1. use a new and qualified USB cable to connect PS4 Pro controller to Cross Hair
2. To keep controller’s connection to Cross Hair stable,
we suggest users should do the following setting on PS4 Pro.
Settings->Devices->Controllers->Communication Method->"Use USB cable"
3. replace the controller or keyboard or mouse, one by one,
to see which one has caused this trouble.