Red cross after HD & battery change.

I'm a bit desperate for any help to get my iPod 160Gb working again.

Can´t seem to get any help from the "repair shops" here in Sweden.

Tried a shout-out to my facebook friends, but no response there.

Bought a battery and a HD from iFixit, got it together but no response other than the red cross. It started to sync once, but didn´t get up. Just the red cross.

Tried to clean the motherboard cable, but it seems it doesn't connect properly...or something.. I do not know

Please, if anyone knows anybody who can help, I am at my mechanical and electronical skills end. I need someone who can take over and get it going.

Getting good at opening and closing the shell, though, but i¨m afraid i'm going to break something if I open it a fifth time..