Not too sure abt this cos I got it from dell online shop and it is autoregistered by dell for my case. As for the service tag number I believe it is the serial number found on the back of yr panel starting with cn-oxp3wk- something.
I still have no answer to the abv. Anyway, I have keep the invoice as well as photocopy of the particulars that were stick to the carton box and assume warranty is valid as long as I have these
hmmm may I know what is yr screen manufactured date and rev, cobi?
It's Aug 2011
Btw have u seen any tinting issues on the screen when u look at solid white backgnd, meaning any patches of pinkish tone on certain parts or part of screen having yellowish patches as seen in my case (pls see my post on page 9 with links to the pics posted) ?
Mine looks fine. I use it in my office for spreadsheet and email only.
u can adjust yr screen to the brightest or by default 75 for brightness and contrast and check carefully.
(For my case, my color tinting issue wont go away even if I calibrate the screen, I need to see if I need to get my place replaced again if this is not common for the rest who currently using u2312, hope the rest of you can kindly advise on this)
I did a simple 'test' using the presets, no screen problem.
Another test, using excel spreadsheet and maximise the window screen, then I select the whole spreadsheet and select color backgrounds. So far all colors look uniform to me.
Recently also read that dell u2412 also having tinting issue( which was released together with u2312 just that it bigger and aspect ratio of 16:10),
so was wondering if u guys have any color tints prob with u2312hm instead when looking straight at the screen from centre so far? any uneven color patches on pure white backgnd screen?
Maybe if I have another 23" screen of another brand than I can make a comparison.. IMHO

