It’s not a good idea to remove insert these two cables twice, when it can be done only once:
BEFORE reattaching the cables, open the screen up to 90 degrees to the machine, and carefully peel off the two bottom strips 4L & 4R.
Being careful not to close the machine any more than is necessary to be able to insert the cables, with the machine wedged & on its stand, wrap a large double loop of low-tack masking tape entirely around both machine & screen, effectively making two “straps” to retain the screen with about a 5” gap at the top enough to access the cables easily. Insert the cables, not forgetting the latch, then test. The two straps of masking tape can then be cut and peeled back out of the way, whilst supporting the screen, before peeling off the remaining plastic strips & closing up the machine. Much easier to get at 4L/4R this way, and you have only done the cable thing 1 time.
This guide is for the Mid-2014 21.5” 2808 machine, which does not have any thermal sensor on the STANDARD 2.5’” HDD. I just completed mine, and it’s totally silent, no fan issues as I’m typing this. I suggest some of the peeps above are posting in the wrong guide, and may have 27” machines with 3.5” HDD with the thermal sensor issue. A great guide, well written and illustrated, excellent 10/10.
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