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One basic problem is that the lighting on the two component images is different.  The background image is illuminated from the top of the image, at a fairly low angle (...note the shadows in each crevice ), but the cassette appears to be illuminated almost uniformly using a large area light source, so that there are almost no shadows or highlights on it.

All of the earlier suggestions in this thread (eg, drop shadow, brightness gradient) were designed to remedy the above fundamental problem.  This is why it is so very important to match the lighting of the component images in any composite.  Doing so will save you lots of time in PS, as well as probably look much better than you could ever obtain in PS starting with un-matched lighting.

Tom M