New to this, My John Deere D105 is about six years old. Working fine, I was almost done cutting the grass, with a small patch remaining. My came over to talk about something, I turned the mower off. But when tried starting again, the PTO won't engage. I didn't hear a pop or any sound that i can recall. So started looking online for possible causes. First thing, Belt might be too lose, so bought a new belt and replaced it. Still no blade engagement. Second thing I read was the PTO engagement cable might have gone bad. Ordered the cable and replaced it. Turned the Mower ON, PTO still won't engage. So running out of options to try,which I found online. The next they tell me is the Idler pulley replacement, should I go ahead and order it ($120). When I turn the PTO handle from Off to ON, the pulley on the deck only moves may be 1/4 of an inch. I saw in Home depot the newer models (E110) that pulley moved a whole lot more. Any suggestion to get this resolved and getting be back to cutting grass will be appreciated!