Problem Cloning Hard Drive On A Dell Optiplex 755

Hello I have the Dell 755 OptiPlex large Tower. It had a small 250 Gb hard drive and I put a 1000 Gb hard drive in and loaded windows 7. The computer will not boot into the new hard drive, I have tried everything, including taking out the battery for a an hour or so, updating the bios to the A22 what ever is the latest Bios, I have checked all the Bios settings and from what I know it all looks good. I have tried changing the pin settings on the drive and so on. Tried boot order in different orders and so on. If I put the old hard drive back in, it will boot just fine, the only problem is that hard drive keeps saying it is going to fail. It's a Maxtor. The one hard drive I'm trying to install is the green 1 Tb western Digital Green Power. I have built several computers and installed a many operating systems and have never ran into this problem. It did belong to a business I bought it from. Is it possible it has some pin settings on the board for like maybe raid or something I'm missing? I'm at a loss. I have no external usb's plugged in except for a mouse and standard keyboard. No extra cards are installed at this time. Everything is standard across the board as far as I know. I have also tried cloning the Hard Drive with Bios set at Raid AutoDetect / ATA and it will not boot. Like I said though I can put the old hard drive in and it boots just fine with windows 7 ultimate 32 bit. Also I would like to clarify that I did remove the 250 Gb Maxtor when I loaded the new operating system on the 1 Tb westrn Digital Green. It would not boot. I then reinstalled the Maxtor and tried cloning it to the western digital 1 tb hard drve and it failed saying could not read sectors. I used the software free from easeus to do back up home 6.1 version trial. Can anyone give me some advice please. Thank You in advance. Robb