Baffled I am. My MacBook Pro simply will not boot up - apart from in target mode.
So far?
Disk Utility, DiskWarrior, Techtool Pro. Not a dicky bird.
Single user mode gives:
CSRHIDTransitionDriver:

robe booting in single user . . do not match
Extension "com.apple.driver.AppleUSBTCKeyEventDriver" has no kernel dependency.
Parallels Desktop update probably didn't help matters - it was misbehaving after installation. Then, after starting to install 10.4.9, crash, bang, wallop. Nothing.
The only thing you can do is an Archive/Install with your original install discs, then download the combo updater to 10.4.9 (310 Mb) from Apple's downloads page and run that. Don't let Software Update update anything until you've run the combo updater. After that, repair permissions, let Software Update update iPhoto, etc. and you should be back in business.
In regards to Parallels: For Parallels to work, it has to create Windows versions of all kinds of drivers which load at startup. Even though it is an amazing piece of software, I'm sticking with BootCamp for now and playing with VMWare Fusion and Crossover as alternatives to Parallels. You might be surprised what's included (integrated into) 10.5. Can't say more...just remember the song "Anticipation."
Hope that helps and please let us know what happens. Thanks.
Many thanks. Astonishing though: it won't even accept my install disk!
Erase and re-format via firewire?
Sounds reasonable. If that doesn't work, I'd worry about a hardware problem.
Good luck
Let us know what happens after you've had a chance to recuperate.
Bizarre. Utterly bizarre. But resolved, thank heaven.
It didn't spit out my DW disk, which I ran. It then, and only then, accepted my OSX install disks. I installed. Clean install. And slowly but surely I'm rebuilding...
This is a lesson for me. I need to back up more frequently!
Many thanks for all your help, as ever.