NP N102S, PbFitis? Win 7. Presumably hardware fault, display died with
pc just sitting idle. "grey" light present of backlight on, going on and
off, on closing the screen down and hinge so switch operating.
cTL-Alt-Del no function, start-up button no function. Had to remove the
battery to switch off.
Powered up via "normal" selection of recovery page.
Next time will try F4 and also an external monitor.
Another time , next day,backlight went, screen contents viewable with
torch . Again no response to C-A-D, but pressing hardware start button
brought back the backlight and previous workings on the display
..
No problems before concerning the hinge switch or backlight going, but
twice over the months blue-screen windoze type crashes, recovered via
normal option each time.
The fan seems to be on noisier/faster. Outlet air is 16 deg C above
ambient, via thermometer, higher than remembered, with pc just sitting
there, charged battery, 30% or so CPU useage. Don't know what is normal
for this though. Is there a route in win7 to see some hardware
temperature monitor readings? What is the likely failing part or cause
for this?

Decided, at this stage, could have been caused by loose clothing up
against the fan outlet grill. So glued on 2 halves of a bumpon either
side of the grill to avoid a simple cloth drape blocking the feeble fan
flow.