Thank you for posting.
The issue that you describe seems to be related to compatibility issues. Try with the set up like you describe at last, (only DVD and SSD connected) try connecting the SSD to the very first SATA port available, most boards have SATA port 0 or 1 optimized for boot disks.
See if you can download AHCI, F6, or SATA controller drivers from Asus* to install when/if the Operating System installation asks for additional drivers.
Since this computer was designed in 2008 before SSDs were released you may be running in an untested compatibility scenario.
1) I have tried this.
2) I'll try this, asus offering some ahci driver but what I've looked at that its just some executable file that opens txt witch instructions.
I tried this disk on 5-6years( I believe its one of first sata laptops ) and it worked... I will post my feedback about the drivers tommorow
//edit: ASUS doesnt offer any working ahci driver, just some wierd application that is useless for me.