The new cable may be either bad or a cross over cable. First check the new cable by holding the two ends together at the RJ45 connector with the little clip down. The connectors should be clear and you can see wire color codes. Look at the colors of the wires as they should match.The left most wires should match colors and each one should match as you go from left to right. If the colors do not match then you have a cross over cable and that will not work.
Now let's work with only the wired clients and not the lap tops via the wireless connection. Don't want to have to many things in the mix at first.
I have not worked with a MAC on a network so I assume they use a standard Ethernet cable and not a crossover so you will want to check this out. By standards the maximum length of an Ethernet cable is 328 feet and I doubt that going across the room you exceeded that length.
If the cable is correct then put everything back the way you originally had it and see if that works. Next add one thing to the network at a time to find out at what point adding something fails.
When you get your original set up working try just replacing the existing cable with the new one to see if the cable has a short or is a cross over. If it works you know the cable is ok. Now add another component to the mix, say the new computer to the existing working network and replacing the MAC. Try to get to a point where you add something and the set up fails.Then go back one step and confirm that everything worked in the previous set up but when I added the next it failed. You can then address the failure point.
One thing about running the cable across the room is and that is does the new cable come near any main AC such as an incoming power line? That can cause interference in the Ethernet cable and cause problems. In your troubleshooting try running the cable across the room in a different direction or across the center of the room until you get things working.
You will want to review your routers owners manual for help.
Good luck.
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