I've got an A1226 and had to upgrade the hard drive. The drive itself is fine. I can boot the MacBook Pro using that drive over USB or FireWire without a problem. However, any time any drive is plugged into the Hard Drive cable (internal) it simply doesn't see it. When I was pulling the old hard drive out, the cable snapped. I could see it was torn across two "wires". I didn't notice until after I tried to boot with the new drive and it couldn't see it. I ordered a new cable and plugged it in with the drive. Still the issue persists. It simply shows the missing folder icon. What gives?