I had a similar issue.
Insert the tray and grindings catcher, close the front door, then plug the cord into the power point.
Turn on the power for the power point, but don't turn on the machine.
The machine will go through a self check, then self reposition the infuser holder/bracket, then turn itself off.
If you then open the front door, you should be able to reinstall the infuser.
Hope this helps,
Brendan
Brendan, October 2010