Is there any solution to this? When i try to boot without cpus=1 my system just quickly restarts, the only way to boot is to use cpus=1 option. I really hate this

My system :
Gigabyte GA-MA69G-S3H
AMD X2 6000+
ATi HD 2600XT 256MB GDDR4
A-DATA 2GB DDR2-800
Seagate 320GB

Edit you /Library/Preferences/SystemConfiguration/com.apple.boot.plist and add cpus=x on kernel_flag area, or try looking on #10.5 or #leoamd rooms on IRC for a other AMD kernel.

Thank's for reply.

I've tried adding cpus=x into Kernel Flags string, but it didn't help. My OS is Kalyway 10.5.2 and i've tried all AMD kernels given by Kalyway : sleepkernel, modbinkernel, speedstepkernel . All of them works only with cpus=1. Are there any other kernels for AMD?
Also strange thing is that when i boot to install DVD no cpus=1 flag needed, but when i try to boot into installed leopard without cpus=1, my system just reboots.

I don't know what to do... Maybe my motherboard is incompatible?

Yes maybe chipset incompatibility, but try copy kernel from DVD and see it boot ok and enable 2 cores on system.

Try use it too on boot:

cpus=2 -F -v idehalt=0

See it boot ok.

Goodluck,