I haven't tried this much, but this might help. It's a SATA-IDE connector, but i think it goes 2 ways. SATA->IDE and IDE->SATA, I don't know if one ever needs a gender changer for this. The power connector on it is not to power the drive, it's to power the circuitry on the board.
You may need a 2.5"-3.5" cable WITH a gender changer, as 2.5-3.5" cables that i've seen are female both end and you need the end of the cable that goes into the laptop motherboard to be male. Also you'd be plugging the 3.5" end into an adapter and then from there using a sata cable to a hard drive. That is different to the normal usage where the 3.5" goes to a MBRD, and the 2.5" to a drive. In this context, I'm not sure if you also have to be careful with which side is pin1 and whether pin1 is pin1 on both ends. (A good technical review of a 2.5" both sides cable in the other answer suggests the red stripe denoting pin1 might only apply to one end, but i'm not sure if that particular point is correct).
This guy demonstrating one, is plugging it into a 3.5" drive. So i'd expect devices that look like that to be 3.5" IDE, but adapting between 2.5" to 3.5" is a common thing, though I haven't done it in this context.
and bear in mind you'd be going the other way completely, with the IDE side towards the motherboard, and with a SATA hard drive connected to this adapter with a SATA cable. (I only point to that picture to demonstrate that it's a 3.5" adapter and how it is powered and what the power is and isn't for)
any sata hdd or whatever hdd has to be powered itself e.g. from a computer's psu. the power supply going into the board just powers a chip on the board.