Connecting a WD800JD Hard Drive to a Compaq Presario PC

[Old Sparky]

Last time I had this issue it was a shortage of SATA power points within a desktop PC and I solved the problem with a couple of these.
The motherboard has plenty of SATA ports that work with the supplied data cables.

There is a spare SATA power connector on an adaptor lead aleady fitted to my PCs PSU, but it doesn't appear to fit the port on the WD800JD HDD, though the latter has the 'Serial ATA' logo clearly printed on it's label, which states ' Use either SATA power or Legacy Power connector - DO NOT use both (What is a 'Legacy' power connector?). The small 'Foxconn' lead & plug attached to the drive is presumably the Data transfer cable.