Hello, the problem is that when i work on my macbook often the screen goes black but the macbook is still on & if i look to the screen i see window & the mouse but i don't have light ... so to resolve this i close the screen then i re open & the screen is on but many times i'm forced to close / reopen 5 6 times or reboot the mac ! i don't know whats wrong ... the hardware test is OK ... :s

i moved the screen many times to test if it is the cable, but the screen still black & when i do F1 / F2 the screen light on. The thing that i don't understand it why for sometimes & not always or often ... If i do an update from 10.5.8 to 10.6.3 it can resolve the problem ? i will test because i have the cd of the update ... i will reply next time.