Wired Network Disconnected - Ubuntu 12.04

FROM ONE DAY TO THE NEXT MY LAN INTERNET CONNECTION STOPPED WORKING. MY WIRELESS CONNECTION IS FINE. CABLES ARE WORKING... WHAT'S THE PROBLEM!!!!

winston@winston-MS-7238:~$ sudo nano /etc/NetworkManager/Networkmanager.conf
[sudo] password for winston:
winston@winston-MS-7238:~$ sudo nano /etc/NetworkManager/Networkmanager.conf
winston@winston-MS-7238:~$ sudo ifconfig
eth0 Link encap:Ethernet HWaddr 00:16:17:b1:a4:5a
          UP BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

lo Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING MTU:16436 Metric:1
          RX packets:856 errors:0 dropped:0 overruns:0 frame:0
          TX packets:856 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:67800 (67.8 KB) TX bytes:67800 (67.8 KB)

winston@winston-MS-7238:~$ sudo lspci
00:00.0 Host bridge: Intel Corporation 82P965/G965 Memory Controller Hub (rev 02)
00:01.0 PCI bridge: Intel Corporation 82P965/G965 PCI Express Root Port (rev 02)
00:1a.0 USB controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 (rev 02)
00:1a.1 USB controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 (rev 02)
00:1a.7 USB controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 (rev 02)
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 (rev 02)
00:1c.4 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 5 (rev 02)
00:1c.5 PCI bridge: Intel Corporation 82801H (ICH8 Family) PCI Express Port 6 (rev 02)
00:1d.0 USB controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB controller: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 (rev 02)
00:1d.7 USB controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev f2)
00:1f.0 ISA bridge: Intel Corporation 82801HB/HR (ICH8/R) LPC Interface Controller (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801H (ICH8 Family) 4 port SATA Controller [IDE mode] (rev 02)
00:1f.3 SMBus: Intel Corporation 82801H (ICH8 Family) SMBus Controller (rev 02)
00:1f.5 IDE interface: Intel Corporation 82801HR/HO/HH (ICH8R/DO/DH) 2 port SATA Controller [IDE mode] (rev 02)
01:00.0 VGA compatible controller: NVIDIA Corporation G73 [GeForce 7300 GT] (rev a1)
03:00.0 SATA controller: JMicron Technology Corp. JMB361 AHCI/IDE (rev 02)
03:00.1 IDE interface: JMicron Technology Corp. JMB361 AHCI/IDE (rev 02)
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 01)
05:04.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6306/7/8 [Fire II(M)] IEEE 1394 OHCI Controller (rev 80)
winston@winston-MS-7238:~$ sudo lshw -C network
  *-network
       description: Ethernet interface
       product: RTL8111/8168B PCI Express Gigabit Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:04:00.0
       logical name: eth0
       version: 01
       serial: 00:16:17:b1:a4:5a
       size: 10Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm vpd msi pciexpress bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:44 ioport:d800(size=256) memory:feaff000-feafffff memory:feac0000-feadffff
  *-network DISABLED
       description: Wireless interface
       physical id: 1
       bus info: usb@2:2.1
       logical name: wlan0
       serial: 94:0c:6d:e3:d4:1b
       capabilities: ethernet physical wireless
       configuration: broadcast=yes driver=rt73usb driverversion=3.5.0-51-generic firmware=N/A link=no multicast=yes wireless=IEEE 802.11bg