This interesting rainbow effect is what greeted me when I booted my newly Leopardised MacBook Pro this morning. At first I thought it must be a driver issue, but with further investigation the video proved to be in “rainbow mode” when booting from the HDD, Windows and the Tiger DVD. It was even glitching on the Apple logo and swirling loading circle.
Thankfully a call to AppleCare soon had it sorted, by resetting the PROM in the device. Here’s how:
- Shut the machine down.
- Turn it on, and immediately hold down Alt + Apple + P + R.
- Wait for the boot chime, the MBP will reset.
- Wait for the second chime, then let go and let it boot.
At which point it all looked normal again. A very weird occurance though; I wondered if it were related to the heat the GPU gets to, Mr AppleCare said to keep an eye on it as if it happens again it would need to be looked at by Apple.
I was on hold for 15 minutes to get to talk to someone, he resolved the issue in a fraction of that time.