Screen flicker on 2011 21.5 iMac after SSD install. V-sync cable?

I've had my 2011 21.5 iMac for going on a year now; I decided to spruce things up by installing an SSD. I followed this very helpful video tutorial and all seemed well, but shortly after booting up I noticed a slight occasional flicker of the screen.
I found this video that shows the issue and some Google searching would seem to suggest there's an issue with my V-sync cable.
I opened the iMac back up and checked the cable and could find nothing apparently wrong with it, although I do remember it initially taking quite some time to get free.
So is the V-sync cable the culprit and would a new cable remedy this issue or is it possibly something else?

I had seen that, I just wish I could find out the length so I can order one if required. I don't want my mac in pieces when I have to take a trip to a pc shop to get a sata cable.  Any ideas on the retaining latches?
Just for info with all the tools/parts and 128gb Samsung 830 this has cost £115.
The majority of this was through amazon uk and the sata power cable part number 922-6862 from an apple repair supplier.
I intend to place the drive beneath the optical drive although I have been playing around with the idea of a slight mod and drilling the back of the case enough to fit the cables through and have the drive external. This would allow me to disconnect the drive Incase of issues or if I decide to upgrade at a later date.

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    4: 00    0 0   0 -    0 0   0 [         0 -          0] unused 
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