I bought a Dell a little over three years ago. An XPS 600. I also got the three year next day in house service warrantee. It was ok for the first year and then I started having trouble with it. I was on the phone with Dell many times. Nearing the end of my warrantee, I had all kinds of problems with it. The service tech was at my house many times with many new parts but couldn't fix it. Two weeks before my warrantee expired I got a letter from Dell offering to extend my warrantee for two more years. Normally this might be crazy but I wrote a check and extended my warrantee. Right after my new warrantee went into effect, I decided that I had enough of their inabillity to fix my machine and started insisting they replace my computer with another one. They finally agreed and because they didn't make my model any more, they upgraded me to an XPS 730. But they sent a refurbished unit. They said that because mine was so old, they couldn't justify a new one. Well, the one they sent me was f*%cked up. It was even missing parts from the case. I called them and complained. They sent me another refurbished unit that was the wrong model. At this point I was fed up with the way thet were treating a customer (me). I called them up and went off on the CSR. I insisted on speaking to a manager. I threatened to call the Attorney General's office, the better business bureau and I also told them I was going to call every consumer advocate in my area. You know the ones you see on tv that report stories like this. The manager said he would fix this. And he did. About two weeks later I recieved a brand new, built for me, XPS730X with all the available upgrades and options. Oh and I almost forgot; under normal circumstances, I would have gotten this computer without a warrantee because it was a replacement for my old one. But, I had just extended my warrantee for two years and it transfered to the replacement computer. the new computer is worth three times what my original computer was. So now I have a great new computer for the cost of a two year warrantee.
The point of all this rambling is this: Don't give up. Keep pushing. evenually you will get someone who will make it right. The last thing they want is an unhappy customer saying bad things about their product. One unhappy customer can cause more harm than 100 happy customers can create good will.
Good luck to you in your efforts.