i bought a new SATA hard disk today. i've connected the plugs properly. i could see it in the device manager but cant see it in my computer. here are my specs
C2Q 6600
4GB DDR2
Asus 9600gt
Vista Ultimate SP1
seeing as it is new, have you formatted it? To see it under My Computer and use it as another drive you need to format it and assign it a drive letter before it will appear under My Computer. Help that is what your looking for.