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[Fast240Z]

You should check and see if your friend hooked the wall plate up correctly.  You need to verify that the wire pinout is correct on both the wall plate and the cable that connects to the router.  I see that you said that there is a wall plate in the living room, but did he install a wall plate in the room where your router is located?  If so, check and see if the pinout on that plate matches the one in the living room.

You can verify the pinout is correct by making sure that the different colored strands in the RJ-45 bundle hook up to the same connectors on both ends.

[stepeters]

are you still using the Cat3 cable in conjunction with the wall plates?

have you tried using a regular Cat5 ethernet cable from the 360 to the
wall plate?

i'm sure i read somewhere that Cat3 has transmission distance limitations?

[scuba156]

are you using a twisted pair cable or a straight cable?

[Scan-C]

299 ft is the max. for cat5 cable which is heavily shielded. I wouldn't try cat3 over that length.

A second jack will not fix your problem! The problem is with the wiring in the first jack. The wires are mixed up so the xbox and your router don't get the "link up" signal which is required for negotiating frame size, transfer speed etc.
I don't know about this leviton RJ45 but from pictures it looks like a color coded snap-in jack. I guess your friend just connected the matching colors which should result in the "link down" problem you experience. That is if I'm right about the jack.
Unplug the RJ45 jack from your router and look at the second pin from the left. You should see a wire through the clear plastic which is either green or orange (don't mix up with brown which is pin .

If the wire on pin 2 is green connect the RJ45 jack like this:

Wire         -      Leviton RJ45
-----------------------------------
green               orange
green-white      orange-white
orange-white    green-white
orange             green

If the wire on pin 2 is orange on the router side just switch the table above.

Just for the records I was wrong about the used wires. Worked to much with other cable for the last few monthes The wires utilized are 1,2,3 and 6.

EDIT:

Is it this what you've in your living room?

[zima]

yes that is the jack he installed in my living room. He had a diffrent color ones with him(blue,green,purple,yellow,orange)

[zima]

Wire - Leviton RJ45
-----------------------------------
green orange
green-white orange-white
orange-white green-white
orange green

Sorry for so many questions. And I truly do appreciate all of your help and time.

[Scan-C]

No repeat of colors On the left side is the wire and on the right the corresponding point on the RJ45 jack. I wrote it down like that because the green wire from the cable is connected to the orange point of the jack and so on. I originally inserted some spaces to make it look better but the board seems to remove multiple spaces

Your cable is color coded as it should but you only need 2 pairs for the networking. As I said above the rest is for power or gigabit ethernet. Blue, blue-white, brown and brown-white aren't used for 10/100BaseTX.

What stumbles me is the colors of the jack you have. Blue could be used for ground which is not required but purple and yellow never ever should be on an ethernet jack. So we need to find out if the jack is coded to work for ethernet (or can be made to) or if it is RJ45 for other applications. If that's the case you need a new jack...

When you look into the jack you should see 3 (or 4 because of the blue ground) pins on the far left side and a single one a bit of to the right from the middle.
If there are 8 pins your jack must have some more colors which I'd need to know.

Do you have a multimeter? You could try measuring out which pin is which color on the jack. Also some pictures might be useful (from the jack and the installation of course )

[zima]

Okay now that you explained your diagram I see it now. I gotcha now we are on the same page. THANKIES WILL TRY THAT TOMORROW MOST DEFINATELY. As for the jack, I think i may have confised you... What I meant to say was he had jacks in diffrent colors. The pic you sent was the exact one I have, I chose the all white jack like the image you sent. he just had left over jacks from diff jobs, some customers use diffrent color jacks to diffrentiate between DATA and VOICE. Yes my boyfriend has a FLUKE multimeter and I would love to learn how to test it with the multimeter. you definately get my vote of approval SCAN-C, you have been extremely helpful and knowledgable on this subject. 10 thumbs up(if I had 8 more). Also I will include pics of the install before and after. THANKS SO SO MUCH  

[Scan-C]

Ah I see! We just use different color wires. Easier to switch when a connection changes from voice to data or vice versa.
There should not be any measuring needed. I just brought it up because of the different colors. If you want to do it anyway put some pieces of wire into all the clamps on the jack, take the multimeter, set one probe on the pin in the jack you want to measure out and the other one on all the dismantled pieces of wire (one after another of course). Set the multimeter to read Ohm. <- Actually do this before you start measuring. Quite hard to do it without free hands but still possible with mouth and a foot
When you get a 0 Ohm reading (or about that, can be 1-2 Ohm) you have found the connection.

Anyway, my diagram above should just work fine. Let me know if you got it working.

[zima]

WORKED LIKE A CHARM!!! THANK YOU SO SO SO MUCH!!! YOU GET MY VOTE FOR APPROVAL!!!! HIGH 5 UP n RUNNING..u r the best. Now I need to figure out how u guys have your gamer cards as yer profile pics  

[scuba156]

under the xbox scene control panel, go to personal info then right down the bottom you can type in your profile name

[Scan-C]

Great to hear it's working! Have fun on live