'I also have the 'vertical lines' problem on my Macbook. There may be something awry with the 10.4.7 Intel update.' Prior to installing 10.4.7, my MacBook had worked solidly for weeks without any sudden shutdowns or screen of vertical lines issues. 'For now I've reverted to 10.4.6 to see if my MacBook becomes stable again. That appeared after I tried resetting the PMU and zapping PRAM. I had not see the white screen with vertical lines problem despite restarting the machine. I initially only had a sudden shutdown problem after awakening from sleep. 'Some speculation is that the NVRAM has been affected by 10.4.7 and this is consistent with my experience. Zapping PRAM temporarily restores normal function, but a reboot later may still result in the white screen with vertical lines. Pressing the power button to force shutdown and restart does not clear the problem. The machine never reaches the desktop or login screen. Upon reboot, the screen goes completely white, then gradually more and more numerous, colored, vertical lines appear on the screen.

'Shortly after installing 10.4.7 (initially via software update and later as the combo update), my MacBook and that of several others have developed an odd malady. As such, some are choosing to revert to Mac OS X 10.4.6, per the instructions in this tutorial. It appears that, for many users, this problem did not appear until updating to Mac OS X 10.4.7. In some cases, users are able to temporarily work around the problem by resetting PRAM, accomplished by holding down the Command, option, P and R keys simultaneously during startup.īad RAM does not appear to be a factor in most cases, with users swapping out modules and still experiencing the problem. After that the MacBook restarted normally.' the only thing that got the MacBook back to normal was taking the battery out then back in. took out the power plug but that didn't help either.

the MacBook just turns off then back to the vertical lines. trying to restart by pressing the start button for several seconds doesn't help. 'After restart the screen goes gray then random vertical lines draw on the screen. Usually the startup process freezes at this point, necessitating a restart. Some MacBook owners have reported an issue where a distorted screen appears during startup, characterized by a series of vertical, multi-colored lines.

Apple mac restart screen