Unable to Detect SEAGATE Barracuda 500GB 7200.12 SATA HARD DISK?

My system configuration is..

Intel Pentium Dual Core 820 Processor 2.80GHz
Intel D101ggc MotherBoard,LGA 775 Socket with 4 Sata Port..
1.5GB RAM=(1+512)
SEAGATE 80GB IDE HARD DISK
SEAGATE Barracuda 500GB 7200.12 SATA HARD DISK
AMD Radeon HD 6670 Graphics Card
IBALL 400W SMPS..

Iam newly bought 500GB Sata hard disk, I installed xp working fine, next day unable to detect 500GB Hard disk,
iam connect 500Gb hard disk alone some times detected some times not detected..

I replaced both cables newly (power & Data) three times same problem. plz suggest...

After one week purchased i return to warranty, They replaced, i get new 500gb hard disk. Still same problem unable to detect..after some reviews in sites iam put a jumper settings in Sata hard disk to minimize speed limit to 1.5Gb/s, still same problem...

Q1. My mother board is capable or not...(few years back i connected SATA 250GB working fine..)

Q2. Any settings in Bios..

Q3. My Smps capable or not...

Iam totally confusing..Plz suggest with proceduers....what to do....

W

try with graphics card removed.your smps is of poor quality btw.
*www.thinkdigit.com/forum/power-sup...89-power-supply-blacklist-thread-newbies.html

Bad SMPS. Can't power everything up in your rig.