after a lot of trying I've finally managed how to install Leopard correctly on a M2N68-AM motherboard. I want to share my experience just to give you some hint I've found. My english is really poor, so forgive my mistakes.
My system is the following:
Motherboard Asus M2N68-AM
Athlom 64 X2 4200+
Generic Nvidia 8400GS 512Mb
Firewire PCI card
DVD-ROM LG GSA 4160B ( IDE )
First time i've used iAKTOS V7, wich worked very well at first boot. Just selected voodoo kernel 9.7.0, AppleNForce ATA, Nvidia 512mb with EFI string, seatbelt ( i can't remember this one for sure ), PS2 and other little things not so important. At that time I was using a sata DVD burner ( GSA-H62N ) wich caused me a lot of trouble, the hackintosh didn't boot up to desktop, and as soon as i figured it out, i installed the AppleNForceATAtest kext that solve me boot problem. But there was still problem with SATA Optical ( it can't burn nothing ) , so I've switched it with an old IDE burner ( 4160B ).
I was trying everything when I've found that my USB port didn't work well: when I forgot one USB drive or something connected in the usb port during boot the system disable it with an error message ( AppleUSBEHCI could not get chip to halt within 100 ms ) , and you had to shut down, disconnect all connected usb stick and then reboot. This one was really a pain to solve. The solution is in the BIOS. I had to set the USB port LEGACY to DISABLE, the opposite proposed on all forum for USB solution...and...that's it...all works perfectly.
My final system is:
AppleNForceATAtest ( http://www.insanelym...showtopic=77071 )
NVinject ( 512mb vga )
Nforce ethernet ( http://www.insanelym...howtopic=125569 )
Network samba sharing fix ( i can't remember but i had problem browsing Windows Sharing and i had to use a little fix, could be this one: http://www.insanelym...showtopic=14544 )
Now i've a really stable and usefull leopard. I've only one problem that i can't solve....when I come back to standby the system become slow, I've to reboot for solve this issue. So i've disabled all the stand by options. Someone can help me with this issue?
Last but not least i've installed Windows XP in another HDD and used grub4dos for dual booting using this procedure:
1) connect one hard disk to sata port 1 and install windows XP
2) remove hard disk from sata port 1, connect the other one to the port 1 and install Leopard
3) connect Windows XP hdd to SATA 1 and Leopard to SATA 2
4) boot windows XP and install grub4dos and grubinstaller ( https://gna.org/projects/grub4dos/ and http://download.gna....-2008-01-01.zip )
5) download tboot ( http://www.digitmemo...files/tboot.zip ) and extract it to windows XP system partition
6) edit/create c:\menu.lst with the following entry:
title Windows XP chainloader (hd0,0)+1 title MacOSx chainloader /tboot
reboot and enjoy.
Hope this help someone
Edit: I was forgotting to say thank's to all member that provide usefull files and information that helped me a lot. Thank you all!