Lion not booting after system definition change.

[hameerabbasi]

Lion (10.7.3) is not booting after changing my system definition to Mac Pro 5.1 from 3.1. Will try booting using rBoot and report back.

Update 1: rBoot booted Lion, let's try re-installing MultiBeast.

Update 2: Re-installing MultiBeast witn 3.1 solves the problem.
Thanks Tony for rBoot and MultiBeast.

 

[ghostdex]

Boot with -v and check if it is the AppleTYMCE.kext

You should be able to boot if you delete the Kext in single-user mode.

 

[bobthemunk]

Is there any way to optimize one's system definition? I'm running Mac Pro 3,1 right now with no problem, but would any other definition benefit me in any way?

 

[KeNgoaiDao]

I'm using GA-UD4XP UD4. System crash when i'm change from MacPro3,1 to MacPro5,1.