for your last question, it would be usefull to know the monitor name to check wether it supports such features or not. In your situation, i would check the information about your monitor again and try to find out wether it supports such features or n...
btw. I just found the email from which i got help with some other stuf servicecenter_am@asus.com i hope this one also works (i am quit sure i was asked to repley on an email comming from this adress so...)
depending on your position you could trade it in at best buy or maybe a different local store at your location the only trade in program i found was one from december 1 to 31 without any information aobut the year.
i just went to their .com page and that is what i found : Contact Us | ASUS to me it seems like you do not have to fill in your serial number. LegalCompliance@asus.com this email is written in their terms and conditions so that meight also be an opti...