Last night I opened up the subject iMac with the intention of cleaning & re-pasting the two heat-sink locations. This machine has always performed well, but the fan has always had the annoying habit of running faster than it should, even within a minute of booting with no apps or other tasks running. A PMU reset had no effect. It's had very little use, but I was surprised at the accumulation of dust since I last peered inside. So a good spring-clean is the order of the day, and to do a thorough job I'll remove the HD/OD assembly, clean the fan, and also completely detach the lower logic board assy from the upper dome/screen - and this is where I've run into my first problem. How to remove the black connector boot cover? (Shown below). I imagined I could easily prise-off the black cover and then detach the connector, but the cover appears to be attached to the logic board (double-sided adhesive strip?), and so far I've not used undue force not wishing to damage anything. To avoid any confusion, the above photos show the configuration on my 20" iMac. The earlier non-USB2 iMac models have a similar connector but in a different location (see iFixit shot below), and their instructions simply indicate, 'Gently remove the cables marked in red.' Believe me, being 'gentle' for the removal of the black cover on this particular connector - doesn't appear to work! Or am I missing something fundamentally simple? My intention was to complete the cleaning/re-assembly last night, but due to this anomaly I'm at an impasse, and left everything dismantled and strewn across the kitchen table. So true to form, I'm in the matrimonial doghouse once again............Help!