is the game better in HDMI or NORMAL CABLE and WHY WHEN I TRY TO PLAY ONLINE I CANT CAUSE AM THE ONLY ONE IN THE LOBBY HOW COME THE GAME DOESNT PUT U AUTOMATICALLY IN A GAME

Find a server yourself then.
And I don't know what you mean by a "NORMAL CABLE" but in theory a HDMI cable would give you a sharper image. But heck, I use an old-skool D-SUB cable and I can't tell the difference