stops booting, can still here some sound but screen goes gray
After it worked fine the macbook went first in to hibernation when booting up, tried to reset the pram but it did not help, then I started it up with the installation disc with no problem, checked the harddrive with the disc utility and it did repair it, when I started up again it boots to a certain point, then the screen starts to go black, you can still hear some sound in the background and sometimes the screen comes to life again for a second or two before going black again, I retested the harddrive and it says it's fine so I reinstalled Snow Leopard but it didn¡t work, then I formated the harddrive and reinstalled the snow leopard on a USB pendrive and tried to boot from there but same result, it starts up, goes all the way to the music and welcome screen and then the screen goes black, with the sound in the background, if I push enter och space, sometimes the screen lights up again for a sec, sombody said it might be the harddrive cable ?? Thanks for help
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