I bought a 1TB Seagate HDD to use on my HP Pavilion. It currently has a WD 250GB as primary. The mother board is a HP A7V8X-LA and has 2 sata ports 1 AND 2. I connect the red cable to the MOBO and the other to the power source. What is wrong with the the SATA ports that the computer does not recognize the HDD? Thanks to all for your help.