The Galaxy S7 Edge has a similar defect where a vertical pink line appears on many units. Do an image search or eBay search for that and you'll see what I mean. Given that Apple is using Samsung OLED panels for the X (which is what the S7 Edge is using) it makes me wonder if Samsung has a bigger QC problem on their hands.

The Firewire spec allows for much longer cables than USB. A bought two 32ft firewire cables that were guaranteed to operate at that distance (www.granitedigital.com) and put a firewire hub to connect the two together. That gave me 64 feet of distance.

I have done CD/DVD burning, printing, and scanning, with no problems over this 64ft distance.

I used a refurb Cybex extender for the keyboard, video and mouse over one CAT5 cable.