Does your new hard drive actually running? I.e. can you feel it spinning?
Did you try to connect your default hard drive with new wires (leads), which you are planning to connect the new drive?
Do you have all options "Auto" for SATA?
What do you mean by SATA2? I heard that the specification for the interface is not yet ready. But some manufacturers put this logo when they increase something like speed, etc. So, there probably might be incompatibilities between SATA2 devices...