Black screen for 3 minutes (UHD630)

[djlucas456]

Hi I want advice on the black screen that when booting. after three minutes the picture jumps up and the system goes perfectly. I found out when I turn off the laptop it doesn't do that. dale i have problem with usb if i wake up laptop from sleep so flash drive works but dongle usb to wireless mouse not. I want to sort it out somehow. please help. Configuration is Dell G3 i5 Coffee Lake. the graphics work fine for me with is installed.

Thanks