MANY OF THE REVIEWERS SAID THEY GOT A GOOD REFURB.  TOO BAD I DID NOT FALL INTO THAT GROUP.  READ THE REVIEWS WHICH CONVINCED ME TO ORDER.  MY 840 GETS EXTREMELY HOT UNDER BATT AREA.  ALSO SHUTS OFF EVERY 3 MINUTES WHILE USING.  ALSO  THE 840 I RECEIVED LOOKS TO BE  VERY WELL USED.  WORKS FAST WHEN ITS ON.  GUESS I WILL EAT THIS ONE.