be sure to tuck the microphone cable and connector into the void next to the camera board.
Gently guide the microphone connector and cables through the ±1in long slot at the right of the iSight camera. Once the bezel is properly assembled, gently push the microphone connector and cable into the bezel through that slot.
If necessary, remove the piece of foam tape covering the optical drive thermal sensor.
To remove the optical drive thermal sensor, use the tip of a spudger to lift the center finger of the thermal sensor bracket while applying slight tension to the thermal sensor cable.
If your thermal sensor is stuck to the optical drive, skip to the next step.
Use the flat end of a spudger to pry the optical drive thermal sensor bracket up off the adhesive securing it to the optical drive.
If the adhesive gets dirty or will not stick to your new optical drive, place some double-sided tape under the two semicircular ears of the thermal sensor bracket.
Lift the black plastic faceplate out of the optical bay enclosure.
You will no longer need the faceplate or the two Phillips screws that held it in place. Set those parts aside if you ever wish to put the faceplate back into the enclosure.
Reassemble the optical bay enclosure without the faceplate, reusing the original three 3.0 mm Phillips screws to keep it intact.
Remove the plastic positioner from the optical bay hard drive enclosure by pressing in on one of the clips on either side and lifting it up and out of the enclosure.
I'd sound a caution before replacing the optical drive with anything else if it's on PATA. It'll be slow... Better using an external enclosure and FW800.
Cool. It worked nicely. I replaced the superdrive with an SSD. As expected, due to the slow PATA connection, speed increase is not as dramatic as one would expect with a SATA.
i followed this guide but i replaced original 3,5 hard drive with ssd and i replace optical drive (PATA) with a 2,5 hard drive 500gb 7200 rpm sata with an adapter bay
and made fusion drive, now iMac start in 15 seconds and it come back to life