Help rebuild failed

[Baablefish]

Hi hope you can help.
I've done some minor upgrades before but have just carried out a complete rebuild as follows and now cant get system to operate hence have had to retro build to old spec to get stystem working -
Have rebuilt using following -
Gigabyte GA P31 DS3L PCI express MB
Intel Core 2 duo E2200 LGA775 Conroe cpu
W Digital caviar SE16 320 Gb Sata II hd
2 X 1gb pc2 6400c4 DUAL CHANNELL ddr2
Arctic 7 pro cpu cooler
Corsair VX450 PSU
GEForce 8600 GT OC graphics card

A couple of problems occur on start up -
1. minor problem - No BIOS beep although can get into BIOS settings and adjust
2. MAJOR problem when reinstalling Win XP system justs gets into a loop constantly asking me to install win xp. Every time I do this the system then restarts and asks me to reinstall again.....

Also is there any way to link my old SATA HD into this system which is SATA II?

 

[Baablefish]

Thanks will go for another rebuild tonight and try voltage etc although dont understand why this should be the problem.
Have reset boot priority to HD then CD but when this is done it checks HD then cd and says disk error unable to read disk (because its not there!) so seems like HD problem?