Look at the rear labels. Check for the revision. They should be at A03. What are yours?

A00 and A01

Get them exchanged.

mervis,

You have to read further down in my document to find =

Monitors without a service tag number purchased from Dell 
When purchased from Dell, you receive a Dell Order and Dell Customer number. This order number automatically "registers" you to the monitor and tells the start and end date of the purchased warranty. You cannot register a monitor via the online tools without a service tag number. If you ever need it exchanged while under warranty, you must contact Technical Support for your country and provide to them the following information -
Name:
Email address:
Shipping address:
Phone number:
Monitor order number:
Monitor 20 digit alphanumeric PPID serial number:
Operating system:
Video card:
Video card ports tested:
Issue:
Troubleshooting performed:
* Monitor Factory Reset done
* Monitor failed Self-Test and Built-in Diagnostics
* Post further troubleshooting

Monitors without a service tag number purchased from resellers (Amazon, Best Buy, Buy.com, Cost Co, Walmart, Sams, other online store, etc.)
* Based on the monitor 20 digit PPID serial number date code start date, Dell will warranty the monitor for 3 years. Note: some monitors were only sold with a 1 year warranty
* You must contact Technical Support for your country. Tell them to open the Dell internal only Oracle Knowledge Information center
* In the search blank, they should enter PNP13081, then click Search. This brings up the article =
Dell Monitor Replacement Policy and Procedure - Dell Global Policy

The customer is unable to provide a Dell Order Number or system Service Tag because the customer purchased the monitor from a retailer. The only information the customer has is the PPID serial number for the monitor. For monitors where there is not a Dell order number available, agents will use the date code embedded in the monitor PPID serial number to determine the start date when coverage started.

Discussion = The warranty will be 3 years starting from the embedded PPID serial start date on the label.
Solution = Set up the monitor replacement against the dummy tag.
* You would provide the following data to the representative if you ever need a monitor replacement within that 3 year period:
Brick or Online Store:
Monitor model:
Monitor 20 digit alphanumeric PPID serial number:
[Your]
Email address:
Name:
Shipping address:
Phone number:
Operating system:
Video card:
Video card ports tested:
Issue:
Troubleshooting performed:
* Monitor Factory Reset done
* Monitor failed Self-Test and Built-in Diagnostics
* Post further troubleshooting