Few quesitons- can we add 3rd party SSD on 2011 IMAC 21.5" base model? On apple uk website their is not option to upgrade on the 21.5" base model. Their is only an 500Gb hardrive. Is it possible to add also an SSD with already the 500Gb Hardrive in the imac? Can we give the SSD to apple to upgrade the IMAC? or any other advise without myself opening the IMAC ? a laptop repair upgrade shop what would be reasonable price to install the SSD if i give them my imac and an SSD to add..to install? Thank you in advance.