Try swapping out IDE cables. Check all cable connections to make sure everything is seated properly. I would advise against connecting the IDE cable aftwer the drive is powered up. I'm not exactly sure what will happen but I've always been told that this is a bad thing to do.![]()
One other possibility is that your power supply may be getting loaded down somehow and connecting the IDE cable is diverting power to ground, preventing the drive from spinning up. Start with the cable checks but don't connect or disconnect anything with power applied as bad things could happen.