Well, actually the glue was for other reason, I've got some cables touching each other so I added some paper between them, and so it wouldn't move I used the glue. Only then, with the already well fixed USB I added a couple of glue drops...
I guess my N900 won't survive a second repair... so... I will treat it very carefully now...
AND, USB data works!!! I've just downloaded a couple photos to my PC and it hasn't blown up!
I'm happy about that!