thank you rdklinc, for your answer. Unfortunately I can't watch youtube anymore in my G5, because I don't have a Flash Player and Adobe just let you download it for Intel machines only. It really sucks. Another bully practice from big corporations. They force you to buy, buy, buy and buy.

I think Apple has a software that takes care of the noisy Hdd. At least I'm sure they have it for some Desktop models. I don't know for the Mac Book. Give it a try. Jorge

O.K guys. Thank you for your support and suggestions. Finally I've got it fix. The problem was in the Left I/O/ board. The first time I connected the computer it didn't work. It was doing the same as before. A dimmed blinking light in the mag. connector. Afrter i spoke with one of the guys, unfortunately I don't recall his name, he suggested to check the connection of the ribbon cable from the Left I/O board to the logic board. He was right. The connector on the Logic board was warped and didn't connect properly. I removed it and straighten it up, re-connected it and BINGO, my Macbook Pro is working again. I switched again the Left I/O board just to make sure that the old one was bad and I finally realized that it was the case. The replacement of the I/O board was needed. Thank you all for your help and God Bless.

I’d rather connect the output to an external speaker. ;)

Too much work. 43 ways to screw up your computer.