Won't boot after replacing some parts
I'll try to be specific.
I cannot make my iPod boot after replacing few parts. As soon as it gets past 'Apple logo' screen it shows 'Sad Face' icon and powers off afterwards. When connected to power supply it acts as if the battery wasn't charged. It shows 'Please Wait. Very Low Battery.' screen and then after some time 'Sad Face' icon reappears and it shutdowns again. After that happens the whole sequence (Please wait... -> Sad Face -> Shutdown) repeats in a loop. This applies to connecting to PC USB port as well as power outlet (via adapter). iPod is invisible to PC, it doesn't appear on Logical Drive Manager list.
None of the combinations of elements listed below work. Hard drives are not initiated at all (they are not spinning). Both are tested to work on my PC (I have a ZIF to IDE converter) although the stock one has many bad sectors.
Now, the whole thing started after replacing battery. Unfortunately, I throwed away the original one before the replacement came so there was no way to verify. So I bought another one and guess what - I get the same results with it. Then I figured out to get a replacement motherboard and again this has not solved anything.
In fact, I get slightly different results for old and new board. The first paragraph applies mostly to the new one (820-1975-A) but to some extent is valid for the old one. One of the differences is that when using the old logic board boot sequence stucks on 'Apple logo' screen and the only way to turn the iPod off is ejecting the battery plug.
Original logic board (820-1763-A) and replacement board from 5.5G iPod (820-1975-A)
Original click wheel
Original USB cable
Two replacement batteries (480 mAh, 580 mAh)
Two hard drives: Toshiba MK3008GAL (original 30 GB) and Samsung HS12YHA (120 GB, bought as a replacement)
Any troubeshooting information is much appreciated as I am completely lost.
Is this a good question?