This was considerably harder than what’s posted here if you have the different later model. Most useful posts for me were from Ledgem - on 11/11/2013 (so thanks for your informative posts!). You do need to take the mother board right out and the plastic chassis that holds the hdd in. Be careful when taking this out as it needs to unclip from the power supply side at the front. It’s a bit of a PITA to get it back in, but just be patient! Also, right at the beginning, the screw closest to the back when taking the fan out needs to come all the way.