check out their return policy on their site, it says
"If your product is not functioning properly, please call our Technical Support Department at 1-800-285-7080 as soon as possible (but not later than 30 days from purchase). In most instances, our highly skilled Tech Support representatives can assist you in diagnosing and resolving your product problems. However, in rare instances, a product is defective. In such case, we will replace the product with an even exchange of the same item, subject to in-stock availability."
it says nothing about not accepting DOA from major manufacturers... does it say anything on your reciept? I'd say it's grounds to dispute it w/ your credit card. after talking to your credit card company and hopefully starting the dispute process, i'd call microwarehouse back and tell them you are doing this, maybe then they'll take you serious and take care of you. be as nice as possible to whoever you talk to, many times they are just following policy.
i'd also say something like you need a working laptop asap and you dont have time to mess around, and that you are realli impressed with how fast they got it to you but you are extremely disappointed in them and would be real reluctant to use them again, you'll trll your friends and people on forums and give bad reviews for them on web sites, blahblahblah.... i've done stuff like this and gotten my way... but i wasn't a jerk.
good luck. sorry about your probs, mine works great!