My computer worked great for about 10 months.  Then suddenly it would crash whenever it came out of hibernation mode.  To get it fixed I had to mail it in (Dell would have come to my office).  After waiting a week without a computer, it finally came back.  But rather than fix the problem they just completely took away my ability to select hibernation mode.  I can no longer hibernate.  Now I have to reboot my computer every time, since hibernation no longer works.  I am done buying Lenovo