After screen replacement iPod is not recognized by computer/turn on
I have been following a guide on how to replace the screen unit on my ipod touch 4g. It's been going well in general, but the hardest part was snapping the digitizer cable back into place.
When I finally got it, I connected the screen power and tried pressing the sleep button. No activity (screen didn't even glow white as it had previously done when the digitizer cable was removed but power cable was plugged in). Additionally, I tried connecting it to my computer in hopes that it would be recognized but it wasn't.
As far as I can tell, I haven't broken ANY cables (including the volume button ribbon cable on the left of the unit), which makes it very difficult to figure out what is not working. I have a cheap voltimeter/ammeter and I was wondering if I could touch certain terminals to possibly find out where power is supposed to be flowing but isn't.
Any help on where to start in this process is appreciated. I would try ordering a bunch of parts right away but where I live it usually takes weeks for them to arrive.