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I just see a plain boot screen when I switch ON the Vic-20.

It is possible you have not correctly inserted the Mega-Cart in the rear expansion port of the VIC-20.
1. Turn your Vic-20 OFF and remove the cartridge.

2. Insert the cartridge (label side up) into the wide expansion
    port on the back of the computer as far as possible.  You
    should see the cartridge like in the photo to the right.

3. Turn the Vic-20 ON.

If the problem persists then it is possible your Vic-20 expansion port has a dirty edge connector or is faulty.  Try to clean them or if possible use another Vic-20.