Some more informations :
I have an official windows 7 home premium OEM DvD (it wasn't burned by me)
and my disk is empty, not formated. it is 6hours old (or a bit more), its first ignition was the first time i tried to install seven.
Ok, so i tested all what you said:
@Night Hawk:
I changed the bios back to default settings (wich include native ide). Yet, i don't really care about AHCI, i just want to install seven, so i'll see later for it.
So i followed the clean install tutorial, and i unplugged one memory stick (I have now oly 2Gb, as recommended), and at step 7 (that must be a joke...

) i didn't seen my HDD...
So i tried to install raid drivers (even if i don't have 2 disk to put them in raid), seven doesn't let me do.. then the mainboard drivers... and it's the same problem...
@gregrocker & karlsnooks:
i already switched the sata cable, port and power cable with no effects... also reversed sata cable (we never know...

)
when i type list disk in the prompt, he say there's no fixed disk to be shawn
ok, so at this step i tried a list volume, ant it said me that i have only a dvdrom...
---
I'll try to find a way to make my disk appear again, and then to do this again...
But, do you know how i can test my disk ? knowing that i don't have any other sata equiped computer ?