No one will give you that answer.  There are two other options: 1.  Disconnect the speaker from the system, or  2.  Decompile, rewrite and recompile the system firmware. There is no option to disable the POST warning of an unrecognized screen.  
Hello, I have a 15z 5523 15.6 Dell laptop, I disconnected the lcd from my laptop, and I am using it with external screen, I also disconnected the speaker from the inside, I am connecting it to external speaker, it keeps beeping 8 times (lcd connector problem) in loops. I understand something is wrong with the lcd since I disconnected it (thank you Dell) how can I stop it from beeping? I cannot use the speaker because its beeping all the time, I tired the D+power on button but it doesnt work for some reason, what can I do?   [IMAGE] thank you!
8 beeps looping all the time when computer is turned on