I have intel original motherboard, and i have two HDD . one is 80 Gb and second one is 500 Gb.. when i pulg only 8 gb hdd is working fine and when i plug only 500 gb its not working,, even 500 Hdd is new and working fine in another system.......i want to use my 500 gb hdd as secondary hdd because i have win 7 installed in my 80 gb's hdd so plz suggest me what is to be done ??