If you have a late model Maxtor, then be aware that a straight board swap won't work. Each board has unique, drive specific "adaptive" information that needs to be transferred to the donor. Some board suppliers offer a "ROM transfer" or "firmware transfer" for US$10 - $20.
Just to add to WyomingKnott's suggestion, I would suggest that a 4-pin male Molex connector may be easier to find than a SATA power connector. You just need to be aware of the pinouts:http://pinouts.ru/Power/sata-power_pinout.shtmlhttp://pinouts.ru/Power/BigPower_pinout.shtml
Early Maxtors didn't have the board swap problem, but you needed to match certain codes on the label of the drive.