Can't connect or detect? He should still have at least one IDE connector. Maybe his CD/DVD is plugged into it. Unplug the CD and plug your drive in there. You may need to go to the manufacturers website and get the proper jumper configuration.
You might want to post the specs of his machine/mobo, in order to get more accurate advice.
If he only has SATA, which would indicate an OEM PC, then you will need a SATA to PATA adapter, which are not reliable.
The other option is to get a USB external HD enclosure and go that route.