HP ProLiant ML350 G5

Hi Everybody,
I Bought this server HP ProLiant ML350 G5
It came without HDD
I bought the HDD and install server 2003 on it
The installation was succeful
but I ca not see the rest of the HDD if I go to my computer
only Drive C is vissible
If i go to computer manahement the Drives are not there either.
Please can anybody tell me what is going on?
I will appeciate your replies Thank you.

What drives do you expect to see? The HDD that you bought will only show as C:

The only other drive would be the CD or DVD.

I have 3 HDD inserted
so i am expecting to see 3 of them.
let say C: D: E
Or do I need to formate them,
if so then How?
They are SAS HDD

You might not have to format them but you certainly have to set the jumpers. The can't all be master.