Won't charge after battery repair. Any ideas?

Hey everyone, i have a bit of a problem here.

So about a year ago, my HDD kicked the bucket. I have recently managed to get hold of a new hard drive and battery for the thing. I opened up the casing (i don't *think* i damaged the logic board) and replaced the battery and the HDD, but now I can't get it to charge up. When i connect it to the power supply, it says i need to restore the iPod. When i connect it to the computer, nothing happens on the computer and the screen just shows the "please wait, charging" screen.

I've tried using my old battery and that hasn't worked either (but the batter had been dead for over a year...)

No idea what to do here. Anyone able to shed some light on the situation?