Hard disk problem


Right off the assembly line
I have following spec computer
intel core 2 dual cpu +Gigabyte g41 motherboard 2 gb ram 160mb hdd dvd drive
one fine day machine does not boot giving error boot disk failure So i check in bios no hdd was getting detected tried chaning cable I thought that hdd was giving problem so i brought new 500 gb seagate sata hdd while installing winxp it was working ok and xp instollation was over but after some time same error come while rebooting ( disk boot failure) comes i tried changing smps but same result i had tried new hdd on another machine it working ok but when i connect to my pc it does not boot sometimes it is getting detected & sometimes does not detect but dvd which is sata i getting detected
please tell how machine can be started
Thanks in Advanced
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