Open the door, and remove the center hinge screw, securing the top hinge to the door jamb with a Phillips screwdriver. Loosen the upper and lower hinge screws an inch out of the jamb with the screwdriver.
Insert a Phillips bit into a cordless screwdriver or drill. Ask a friend to pull up on the door handle slightly, while you drive a 6-inch wood screw into the center mounting hole of the top hinge with the drill or cordless screwdriver. The longer screw will bite into the wall framing and draw the top hinge tighter against the door jamb.
Tighten the upper and lower hinge mounting screws. Hold the door at the half-open position, and release it. The door should stay in the open position. Test the door at the three-fourths- and one-fourth-open position as well.
Close the door, if the door still closes on its own. Place the tip of a nail under the hinge pin of the top hinge. Tap the end of the nail with a hammer to drive the hinge pin out of the hinge. Grab the head of the pin with the claw of the hammer, and pull the pin completely out of the top hinge.
Lay the hinge pin on a flat concrete or solid surface. Hold the end of the pin opposite the head. Strike the center of the pin a couple of times with the hammer. This creates a small bend in the hinge that draws the top of the door tighter to the jamb.
Insert the hinge pin through the top of the sleeve of the upper hinge. Tap the hinge pin down into the sleeve with a hammer until the head of the pin is flush against the sleeve. The door will now stay open in any position until you close it.