I am thinking your color wheel broke. it maybe still spinning and thats why the tv still comes on.
if you are handy you can open it up and replace the color wheel. look up the part number on
www.samsungparts.com and then check out
http://www.discount-merchant.com/?Click=38489 for the part number in case the price is lower. you can also check ebay.
ps. the color wheel is inside the light engine. you have to slide it forward and then there is like a metal cover over it that has fins kind of like an motorcycle moter. should have 2 screws holding it up. then it just pulls up. then there are two screws that hold in the color wheel. remove them. and there should be one or two wires that should unplug from the dmd board. one will be a flat ribbon cable. make sure to plug in the new color wheel the same way as the old one.
what happens sometimes with the color wheels the barrings start to go out and then they hit into the casing and it makes the disc shatter. Also it would be good to use your sweeper to suck up broken color wheel.