Ok, I have a old macbook, late 07 white macbook to be exact. What the problem was before OS X wouldnt work was that some certain programs would stop working. First it was Macromedia programs like director, then it was games like Warcraft III. What would happen is i would click on the applications and i would hear a rapid clicking noise then it would stop, like something was loading and then suddenly stopped. It would make this noise 3 times and then the whole laptop would lock up for a minute then it would say the application quit suddenly. At first i thought it was the application so i deleted it and tried to reinstall it, no luck it wouldnt even re install. Other applications would work so it was rather confusing. Then this error would happen when i tried to install the new patch for WoW. So i went to restart my computer to see if that would fix it. This is where the BIG problem begins. After i turned off my computer and turned it on again it would only load up to the blue screen, the cursor shows up on the upper left then that loading noise starts, then sometimes the cursor disappears and the screen turns into a different shade of blue then back to the same and the cursor shows up again. This repeats forever, one time i left it like this for an hour and it was still doing the same thing. So now im stuck on my Windows side which is really confusing. If OS X wont work wouldnt Windows not work too? Also, i tried safe mode and it wouldnt work. I have my OS X cds here but im concerned if i use them wouldnt i lose my Windows side?