My second attempt to upgrade the storage drive

Hi Clorissa, this might seem silly but many people actually miss out on these simple things. Did you connect the SATA power cable to your hard drive from the Power Supply Unit? Did you enable SATA controller or SATA ports or somethings like that in your BIOS? Think over and you might find a solution.

Well, you said that your HD isn't recognized even by your BIOS, right? or is it recognized wrongly? If it is not recognized by your system, have you check your cable and jumper setting? If your harddrive recognized by the BIOS but your OS not detect it correctly, try to re-format it (using XP, make sure the format is FAT32 or NTFS). Never dealt with 1 TB HD before, but I think new Motherboard, Chipset, and current OS are able to recognize it. Another question, have you try to check it with HD vendor? check it on official website or store for your HD compatibilities. Hope this can help.

Are the two computer systems running the same version of the OS? That could have a lot to do with it. Normally if you plug in the hard drive into your usb port (for external) the system should reconize "something" If it is not it could be a compatability isssue with either your system or the unit itself. In windows you can do a manual set-up and prepar it for the new hard drive there is a componant called "add new hardware" and this is where you can tell windows to look for spsific drivers that would be read by your system to reconize it as an external drive. As for internal parts, its best not to install them yourself unless you know what you're doing. Those can be tricky and attaching and detaching can break cirtin links your computer needs to properly read the hardware. If no one here can explain it in greater detail, (and even if they could) I'd consider taking it to a professional who can advise you on the proper way to install hard drives like that.