Doors and Windows - Door won't stay open

I have bedroom door that won't stay open. Open it and it will slowly close. The bedroom is carpeted.

What is the best approach to fixing this. Do I re-hinge it or sand the bottom or top? How do I identify where the imbalance is?

Any help will be greatly appreciated.

Thanks.

The easiest way to fix this is to plumb the door by shimming behind the hinges with something, such as a piece of popsickle stick, toothpicks, wooden match stems, or old utility knife blades.
You just loosen the hinge screws, and shim out behind the hinges until the door stays exactly where you left it in whatever position. Just have to experiment a bit.
You can use a level on the outside edge of the door to see which way the door is leaning out of plumb, and that will give you an indication of which hinge to shim under.
The problem may be loose screws in the hinges, however, in which case you remove the screws, fill the holes with toothpicks, break or cut them off flush, and then re-screw the hinge to the jamb.
Good luck!
Mike

I find strips cut from cereal boxes are great shims for hinges. Plus, years from now people can wonder "Who the heck is Cap'n Crunch?"

Just a little trick i use. If it is not off verry much I pull the hinge pins one at a time. Dent the diameter of the hinge pin with a hammer so as to raise a little metal. Reinstall the pin. This will usually hold the door where ever you put it. Depending how often you use the door it will last for years. Pretty funny but it works.:)