I'm sure there are people that are gunna disagree with this one, so only do it if you feel confident and know roughly what yer doing.
If it's possible, try and put the miggy back together while it's still on. That way you will be able to physically see when it goes wrong, then you'll know at what point the problem lies.
Then you take it out again, get it up and running again and start putting it back in. If the problem occurs at the same time then the problem is whatever is happening at that stage.
