AC Adapter

i bought the Latitude E5500 Laptop mith the AC Adapter / Charger in January 2010.

The Sevice Tag is <ADMIN NOTE:Service tag removed per privacy policy>

Now the AC adapter is defective - the Connector LED stayes dark!

I am depending on the funcionality of the Laptop!!

How can I get as soon as possible a new AC - Adapter for The Latitude 5500?

I should be within the Warranty.

I would be glad, to get a information or a link to solve my problem

Yac