Sadly,, I'm having the same issue with a HP Elitebook 8730W. It was turned in when the teacher left the school. I can't access/update the bios :(. The "lock" appears to part of the laptops security features. I understand the importance of security, but I now have a $2k paperweight.
I too have contacted HP support, but nothing seems to work(batteries out overnight...). I have 4 of these 8730's and I'd like them to stay in service and BE SERVICEABLE.
Is there a method other than replacing the Mother Board as mentioned in the thread above to resolve the issue.
Any help would make me your best friend for the rest of the day! :)
Thnx in advance.