I think it was probably cause through opening the lid & closing it with time,
without me noticing the lid until one day a long line appears grossly visible
as you close slowly your laptop lid. The piece missing was because i let
it further disperse and break-off because i was too lazy/negligent to put
a scotch-tape on top of it. it will break off one day, anyway.
Last weekend, I dropped my notebook from 3 feet while transporting in its original bag. Luckily, nothing happened. I'm telling this to support the idea
that it was not cause by mishandling nor shock accident, but through
"normal" usage. I rarely close the lid except when transporting from one
place to another, then again I always handle it with care, beside the last
I looked further at the other side, it has a slight nearly visible "vertical stress-line",
therefore i would say the plastic material used for the lid is way too fragile
and thus of inadequate quality for long-term use for a notebook like ours.
Anyway guys, i've looked in the forum through previous post and it looks like
a lot of people are experiencing this type of cracks: "stress-line fracture".
I'm starting to get worried about the other side. Something must be done.