I have a 13" black macbook that was bought in 2007. It has pretty standard hardware, such as 1GB of ram, 160GB HD, etc. However, it has been having problems for about a year now. The first problem it has relates to the computer lagging/skipping. The computer always lags (using a mouse or trackpad). It lags/skips when i'm browsing the internet, playing itunes (the songs actually skip and get choppy), playing a dvd using the DVD player app, and when I watch any type of video on the internet (youtube videos, flash videos; the audio gets choppy and fuzzy). The second issue I have been having is random shutdowns. Sometimes, I will be typing a report or browsing the internet and I will get an error message telling me that I have to restart the computer by holding down the power button. This has happened about 4 times. I think these issues might relate to a bad logic board, but I am not sure. Any ideas? How much does it cost to fix these issues? Thanks