Audio not in sync: Just stop and restart, 9 times out of 10 this fixes if there is not a problem with disc or player.
Artifacting: the disc may be dirty, please clean it with the following instructions:
Cleaning your DVD: Dirty discs should be carefully cleaned using a soft dry lint-free cloth or camera lens tissue. Holding the disc by its outer edges or center hole gently wipe outward from the center hub toward the outside edge of the disc (just like the spokes of a bicycle wheel). Do not wipe the disc using circular motions, as any scratches created will do the least damage if they cut across the track of marks and lands. More stubborn fingerprints or stains can be removed using a soft lint-free cloth lightly moistened with water or a commercially available DVD/CD cleaning fluid. Do not use vinyl record cleaners, lacquer thinner, gasoline, kerosene, benzene or other solvents, as these may damage the disc. Manufacturer directions should always be followed.
If this does not help, the disc may be faulty. (Scratches may not necessarily mean that disc won't work, please try it in multiple players to verify a faulty disc.)
If disc keeps spinning and won't load, stop and reload. 9 out of 10 times this works.
Black bars: These are normal and advantageous (this is called "Letterbox", see below for definition), but zoom function will make it better if this is intolerable Check settings on player if picture is squashed or stretched, make sure it' s 4:3 for normal TV, 16:9 for widescreen.
Letterbox: Refers to the image of a wide-screen picture on a older 4:3 aspect ratio television screen, typically with black bars above and below. It is used to maintain the original aspect ratio of the original source (usually a theatrical motion picture of 16:9 aspect ratio or wider converted to an older television screen aspect ratio of 4:3).