I have the same issue.  Also a 700m, just bought 3 months ago.  It flickers about once every 2 hrs or so.  It seems to very, though I've never seen it on bootup.

 

  It's true it doesn't seem to be entirely just screen.  I thought it was until minutes ago.  It did it twice in a 1 minute span.  I had my cursor over a link so it was showing me the address down in the status bar.  I could've sworn when the screen went off and came back on that for a second that address wasn't displayed down there when it came back on.  Which tells me it wasn't just a monitor blinking out, 'cuz if it was everything would still be exactly the same.  It's like it stopped picking up the mouse for a second..  But possible something else could cause same symptom.

 

  Also, my boyfriend had bought their inspiron 6000 new at the same time.  He returned it a week or so later just due to being too picky on quality.  But his had the same issue of flickering off briefly.