Hi there, basically I was wondering if there was a way that you can change the default kernel Leopard boots up with, as currently I'm dual booting my Kalyway 10.5.2 system with Windows XP Professional. I want to use either the "sleepkernel" or the "speedstepkernel" as default as they are the only 2 that work for my configuration (I'm using an AMD Athlon 64 3500+ CPU which doesn't support SSE3). Stupidly of me, I accidentally selected the "modbinkernel" when I was installing Kalyway 10.5.2 along with the other 2 (sleep and speedstep), and by default it boots with the modbinkernel, which never works as it is an SS3 kernel , so if there is a way of changing it then it would be greatly appreciated, as I'm reluctant to reinstall it all over again, and it gets tedious after a while by having to always type in sleepkernel or speedkernel at the boot options in the Darwin/x86 Bootloader. Thanks in advance.

Kind regards,

Livio.

In Terminal:
sudo nano /Library/Preferences/SystemConfiguration/com.apple.Boot.plist

<key>Kernel</key>
<string>mach_kernel</string>

And change mach_kernel to sleepkernel

And save it (Control-X)

Okay thank you very much, I will try it out later

UPDATE: It's all working now thanks to your solution - boots flawlessly into sleepkernel and no more tedious typing thank you once again!

many thanks, this also saved me from paying attention at bootup and typing "voodoo"