FANTASTIC, THANK YOU, THANK YOU!
Never knew what the problem was and now its fixed!

With respect to the author - on the part where you have to remove the 4 corner clips (tricky part), it looks in the photo as he preyed the rounded TOP part of the clip, what worked for me was pushing the flat bottom part away with a small screwdriver.

also removing the glass - you are pushing up the plastic frame not directly the glass. Plastic or wood wedge did not work for me - a large flat screwdriver, cardboard and a "wince" got mine released.