What is this guarantee called and where is it available?
Here in Russia, I've had experience of giving away my ThinkPad to the service company for 2 months; they didn't call and the call center girl could not provide further information than "it's being worked on" (the law here requires service centers to complete repairs of such equipment in 3 months,). When I finally had enough and went to the service center for the explainations, or to retrieve my laptop back, and asked them what took them so long, they said they have "emailed IBM but they didn't answer back" (it was a while back and my ThinkPad was X60s, from IBM). It even was working, I just had some issues I wanted them to work through (e.g. the cooling system became noisier and hotter, apparently having been clogged with dust; etc.)