Black screen literally every other boot

bigdisney

Honorable
Jun 3, 2013
20
0
10,510
I have a sabertooth z87 and when i use the cpus graphics through hdmi, it goes to a black sceen lierally every other boot. when i use my gpu it goes to the bios every time. why does it only go to bios half the time when i use the cpu graphics?