Motherboard was the problem.
Lightining cooked puter power adaptor.
I bought new one.
Then motherboard recognized hd but when I asked it to reboot from cd to install windows, it stopped recognizing it so it was in a loop, recognizes hd - reboot - lost hd.
Cleaned up cmos, unplugged battery and cleaned up cmos again etc, nothing changed.
The weird stuff is it always recognized dvd recorder, the problem was only with hd.
Replaced my MB Asus for a new one the same model = everything is fine.
Thanks to all of you who tried to help.
Damn I hate wasting money with puter stuff
If a computer tech(a real one and not a guesser) knows what was the problem, please post an answer here cause it might help others who someday could have the same problem