Firstly I would try switching on the receiver without the Matrix Reloaded CAM in it. Select an FTA channel. Switch off the receiver, put in the Matrix Reloaded and switch on the receiver - hopefully the Matrix Reloaded will reinitialise.
The important thing is to be on an FTA channel. If it does not work the first time, try again taking out the Matrix and putting it in again - up to 10 times!!
Good luck