Thank you for your reply.
I will recommend you to contact HP since the system has its own customizations performed by HP also, the recommended driver for Intel management engine should be provided by the system manufacturer HP ProBook 650 G2 Notebook PC.
Intel Customer Support Technician
Hi there, thanks, this is a good advice. I have done that both immediately after the error occured the first time.No chance... In fact, the bios tells me the state of the IME to be version 0.0.0.0. Even the tool MEInfo cannot connect to the IME anymore - seems dead. Regards, Oliver