Rainbow Screen

I spoke with Apple and was given these instructions on a fix for the "colored vertical lines at startup" issue.

1. Shut the computer off.

2. Restart holding the Option-Command-R-P keys down, wait for three "bongs" and release keys. MacBook should boot normal with no lines.

3. Next, open your System Preferences control panel and open "Displays" in there. Now change your current resolution setting to some other resolution and then switch it back to your current setting. Close preferences and reboot to test. It should keep rebooting normal without the lines.

- Bmer
Mac Owners Support Group
Join Us @ MacOSG.com
ITMS: MacOSG Podcast
 An Apple User Group 

I don't think it's a logic board problem, I think it's a bug in OSX that doesn't record the PRAM settings properly.

A fix that has certainly worked for me is after you boot (after seeing the rainbow), change screen resolution (under system preferences) and then change resolution back to your normal settings. This seems to refresh the settings in the PRAM and everything is back to normal. Since I did the the problem hasn't recurred.

whe mine shuts down unexpectantly, i get the rainbow screen (sometimes verticle, sometime horizontal, a dark screen, and sometimes nothing.

ive been waiting for a return box since july 13th when i first called. ive called 4 other times and still no box. next year i will post what they may have fixed

Lucky SOB's. Mine has that problem and it will not go away, regardless. I took it to an Apple store Sunday to send it in; even the techs were surprised nothing worked to get it back. On top of that, the logic board was failing. Lucky me :/

White MacBook Mac OS X (10.4.6) 2 GB RAM, 2Ghz, 60GB HD

I had my logic board replaced and HD too. I had the same problem with the display and used that same trick. It has not happened since for me either

I was trying to Change it reslution( i had the rainbow problem once) and i did not no what the normal settings were. Can someone fill me in.
Thanks,
Damasta