I'm also having this issue with a PSOD indicating no heartbeat from a CPU on a DL 360 G8 dual 6-Core 32GB B320i system. Had to do a shift-R to get back to 5.1U1. I never got the machine to boot, it would just PSOD during the loading screen. I tried tweaking a few BIOS settings but didn't want to mess too much with it since the system is running just fine with 5.1U1. Has anyone found an actual fix for this issue or is it just wait for HP to fix their ISO?
Thanks