common bug, its voltage related. i hear oscar has bigger issues so wont be fixing it for a few weeks at least.

trick is to hit ins (the zero on the numpad) and hold it just after powering system, PC loads at stock settings without saving them....

get into BIOS, lower your multi 2-3 notches. (so its roughly stock Mhz) reboot, and raise it back and it should be fine from then on.

its just a cold boot bug where the startup voltage doesnt set right, i beleive.