I have been listening to itunes on my iphone that I've downloaded for the past few hours. THEN, I decided to download more. I logged into my Apple Acct and did download one, but it only played a portion of the song, and not the whole thing. I had bought it, not just listened, but the playing time was only like you get as a sample to see if you want to buy it. I tried the song (that said 'downloaded') and got the same shortened version - many times. Next, I tried a song that I had just listened to the whole song, and it too was shortened. ?? Same with all the songs on my iphone. It had been playing a scramble of whole songs, and now all are short versions. I went to my computer and clicked on the iTunes icon, and an iTunes page came up that looked like I had never been there before. NO songs purchased, etc. I looked everywhere for 'help' but what help there was - wasn't the help I needed. I needed TECH help, but there is none. I decided to purchase a song on there, just to see if I could. A message popped up that said 'This computer is not authorized.' Whaaat? I DO have a week-old new computer, but one of the first things I did was to add iTunes, and all was well then. (My purchased songs were listed, etc.) My latest iPhone has icloud and my iphone has been working perfectly since; that is, until I tried to purchase a new song, and then *everything* was shortened!! Sorry this is long. I am bumfuzzled as to what to do or what has happened. I reinstalled iTunes, told it to 'repair old files' as it suggested. Then - the same thing as before. "This computer is not authorized to buy." There is *nowhere* to get tech help on iTunes that I see. Can anybody here help? Or even give me a clue on what to do? Thanks so much!