Thanks Chris. I think that's all I needed. ps. the link to the on-line manual is  downloads.dell.com/.../dell-u2312h_User&
I recently bought a U2312HMt monitor from an on line retailer. I understand I need to register it to get my 3 year warranty. When I try to register on line I am asked for a Service Tag which the monitor doesn't have. The Dell website says many monitors don't have one. I have a serial no in the form of XX-XXXXXX-XXXXX-XXX-XXXX. What do I do? There have been other questions about this in the past but the answers involve private messaging etc. John 
Warranty registration without a "service Tag"