I'm still having trouble playing movies and videos on iTunes but like ppl said its not my monitor but I did a cheak of my system using Nortons 360 and only thing wrong with it is the
random access memory ((R.A.M.) 512 MB) is low and also said it needs to be higher even with estiment 950 MB and both desktop computers are DDR1 memory moderals (computer memory chips). I'm not sure if one or two ...