HP Z240 spontaneously goes into Bios Upgrade loop. Once in this loop it will dutifully try to update and reboot ad infinitum - see the attached screenshot. There is nothing you can do. There appears to be no trigger - it just happens. You can be typing, you might come back to it in the morning if you left the machine running overnight...
This has happened 7 times in the last 24 months. Each time HP have sent an engineer who dutifully replaces the motherboard.
They have occasionally replaced the PSU. The unit is UPSed and the Z440 that sits off the same UPS never has any problems what-so-ever.
Effectively the machine is unworkable.
So the questions are:
Does anyone else have this type of problem with the Z240?
Do you know of a fix without replacing the motherboard (CMOS reset does nothing)?
What happens the Carepack runs out?
HP's approach has been, you have to wait and see as this motherboard might fix it. They clearly know nothing of how computers behave, to type. BIOS_Upgrade_Loop.jpg