Samsung Notebook, crash to black

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?