I don't have a Seagate IDE drive to look at but the WD 80 gig drive I do have appears to have a plug from the edge of the board to the motor. The controller board is attached as most hard drives with four or five screws. A Seagate 160 Sata drive I have uses pressure contacts and boy are they dirty, discolored by heat. They brighten up nicely with a pencil eraser. That board looked like it was a soldered board so remove the screws and you will know what you have to do. If it is pressure contacts brighten up the motor and controller contacts. That might be the only problem. I know this drive was marginal so when I clean the controller contacts and put it through it's paces I'll see if that made a difference.