This reads as if someone tried to make their own cables. I would be replacing the cables with factory made ones or checking the wiring. Remember, wiring pairs and cable information is on the web which I do no duplicate here.
The cable modem is in a room on the west side of the house, Thats "her" cave, studio den whatever. She has her mac book (wireless) her iPad, her DVR. The cable from the modem goes to a NEW high end router for her devices and the network printer. One cat 5 runs thru the wall, the attic and down into my cave on the east side. I tried running that cat 5 directly into an unmanned 8 port switch and then hardwire 2 of my computers, my DVR and dvd player. Good network but no internet access. I hook up a second router to the incoming cat 5 and run hardwire cables, still no internet. Wireless connections are very spotty and drop frequently. SSIDs are on and security is enabled. Should I use a switch at the main router to send the signal to the back?
No hair left to pull out.
Also primary wireless connectivity is spotty IE cell phones connect but no internet more than not.

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