ethel may be right .... but if you can see the desktop .....
is it a "ghost" image ... or a real image?
in my experience - normally with powersave the screen is completely blank
if you can see a real desktop - my guess is that the backlight has gone.
you might be lucky and it's just the lead that's loose (you still need to open the machine up)
otherwise ... it'll cost �100.00+ for a new screen (probably wiser to get a flat screen monitor (with TV would be perfect - at least then you can use it when the lappy isn't in use)
http://www.google.co.uk/products?q=LG+17LS5R+1 7+INCH+LCD+TV&btnG=Search+Products
strangely a 19" costs less (�123.00)
http://www.nextag.co.uk/LG-L1953S-19-LCD-54156 4660/uk/prices-html
unless you need the "laptopability" of being able to carry the thing about