Hard drive not working after dvd replacement attempt

After taking Black Macbook apart to replace the dvd player with an SSD, I realized drive was PATA instead of SATA. So put everything back together, and now hard drive is not showing up at all. Also, I'm able to start via firewire hard drive, but the light/sleep light is not turning on regardless. Any help is appreciated.

core 2 duo 2.4 2 GB