You're just going to have to be persistent I guess.  This is the number for Tech Support:

1-800-624-9896. Check

During the one-year period beginning on the invoice date, Dell will repair or replace products covered under this limited warranty that are returned to Dell's facility. To request warranty service, you must call Dell's Customer Technical Support within the warranty period. Refer to "Getting Help" in your Installation and Troubleshooting Guide to find the appropriate telephone number for obtaining customer assistance. If warranty service is required, Dell will issue a Return Material Authorization Number. You must ship the products back to Dell in their original or equivalent packaging, prepay shipping charges, and insure the shipment or accept the risk of loss or damage during shipment. Dell will ship the repaired or replacement products to you freight prepaid if you use an address in the continental U.S., where applicable. Shipments to other locations will be made freight collect.

Good luck

Let me give you some feedback about Dell support, I had lots of problems with my monitor I purchased from Dell but not as much trouble as to dealing with Dell support. Yes, Dell has great products and yes, I buy from Dell since the other major vendors' products aren't as good.

I received two defective monitors from Dell. They had some dead pixels in them and I am picky enough as to when a product is somewhat defective, the client has a right to get it replaced, even more within the first thirty days.

When my first monitor arrived I was happy to find that quality was good aside from the pixels. I emailed customer service and we then proceeded emailing back and forth between me and Dell three times (3 days). Dell has a problem of sending troubleshooting links which to a knowledgable computer person is a waste of time. Even more importantly, I as the consumer should not try to fix and troubleshoot my own system when it is defective. Finally, I decided to call.

After getting to customer service they passed me to tech support who deals with monitors. (or tier two techs or slightly smarter people that can deal with customers!:)) I expressed my issues and I easily got my first monitor replaced. State your case and no problem. Then my second one arrived and there was problems with that one as well. I emailed tech support about getting a replacement and again, received a DELL email link for trouble shooting. ARRRGGGGG!!

I again called customer support which transferred me to tech support which said "we don't replace monitors due to pixels under 5. Again, state your case and either ask them what they rather want: a return of the monitor or fix the problem.

The solution: We are the clients, they are the sellers. As the client you have the right to do what you feel is in your best interest. Call Dell tech support. Talk to management if necessary and state your case and your issues should be solved!

Good luck!

P.S slightly harder now after the thirty days!