Upgraded my Asustek BIOS version from version 1012 to 1021 beta version. The reason behind the upgrade is because my PC fails to detect the SATA hard drive at times. I am not sure whether the BIOS upgrade will fix the problem or not. But I definitely feel better with the new version.
Also spent some time to look into the PC sent back by Ah Teck. I think it is beyond repair. But the Maxtor hard drive is still kicking.