I've been very happy with my Lenovo Y650 Ideapad. Well, much happier after I installed Ubuntu 9.10 beta (tangent...) but I noticed last week that the power cable, from the brick to the computer, was fraying. I've only had this laptop a few months, so this is definitely strange behavior.
I called in and Lenovo quickly sent me another one. But within a few days, it started doing the exact same thing!
This is totally unacceptable, so I'll be calling Lenovo now and we'll see what they say.
Update: I'm on the phone with them now, and when I started handling the cord to look at it closer, I could see sparks. Not cool!