Hi I recently bought a new 27 inch iMac. The one problem I found with it was that it sat too high on my desk and was giving me neck ache - usual ergonomic advice is to have the top of any screen at eye level but the iMac stand puts the top above this. To solve this I cut a small section out of the back of my desk, put a small shelf underneath and placed the iMac on this thus the screen is now at a perfect height. My question however this has placed the bottom of the screen and thus the air vents about an inch to three quarters of an inch above the desk. Does anyone know if this is likely to cause any issues with cooling?