thanx, i've tried changing the udma mode a thousand times, and did not work anyways, i don't know what to do.

i've now noticed that when i boot from the old dvd, it does not search for drive units.

in the 10.5.2 it says at first "1 unit found-", and later "0 units found"

and after saying Launched version 5.0

it starts coming disk1s2: unsupported mode, again and again