Not enough info.
You didnt say if you have IDE HDD on mobo w/O/S or just are starting fresh with SATA
You have to go in bios and turn off IDE channels if no PATA HDD
You must turn on just SATA you are using - nvidia on chip or other vendor chip - Silicon Image.
If you are booting from that drive, you have to set that in bios also
Once bios is configured, you can format and partition drive from floppy with HDD install utility extracted to floppy disc
Only connect one power connector to SATA - the 15 pin is preferred if PSU has it - 4 pin molex otherwise. Plugging in both may blow drive.
If your mobo doesnt support SATA II, you will have to jumper down HDD to SATA I
The manual should tell you preferred SATA connector to use first (out of four nvidia)
When the SATA controller you are using is on in the bios, and you can see drive, during XP install you need to press F6 when prompted for SCSI drivers and have SATA drivers for correct controller on floppy (from mobo CD). Windows install CD will find them. Or if your XP CD already has SP2 on it, the install will load the generic MS SATA drivers.