Macbook Pro (Lion) won't recognize Ethernet cable

Hi
I'm using a Macbook Pro (15 inch, Early 2011, Built-in OS X Lion 10.7.5)
Normally I connect over Wi-Fi and I have no problem. I used to connect via Ethernet (Cat6 cable) sometimes when I was at work and I had no problem back then ( I didn't have to change any settings).
Recently I had to connect via Ethernet in a facility that used old networking systems and I had to adjust all the proxies and IP settings manually. I had serious problems connecting with LAN eventhough all the settings and proxies were set correctly and other computers on windows were able to connect easily. I even tried to connect by restarting to Windowns 7 in bootcamp but it didn't help. The cable was a cat4 I think and after a while I noticed that in System Preferences>Network>Ethernet the cable in continuously getting connected and disconnected ( Green & Red). The IT-man there couldn't give me any advice beyond that my Network adaptor has problems or cat4 is responsible. After a while I found out if I set the configuration to Manually and set the speed in Ethernet>Advanced>Hardware>Speed to 10baseT/UTP I'll get rid of the disconnecting problem and the connection works without problem.
When I got back from that center to my original workplace I set all the settings to the original automatic setting and connected the Ethernet cable (Cat6) and at first the cable was detected (Green) but the IP address was wrong and I couldn't connect to internet. I disconnected/connected the cable 2 or 3 times and after that the Ethernet was not even connecting or detecting the cable and I had the message "Cable Unplugged". The IT team at the center couldn't help me either and the problem remained even in Windows 7 over Bootcamp.
I came to home and tried to connect with a 5e Ethernet cable to my Linksys router ( that I normally connect via Wi-Fi). But the same problem: Cable unplugged. While my brother was able to connect with the same cable with a Windows 7 based VAIO.
I tried to connect with the Ethernet cable to my brother's laptop and it gets connected and obtains an IP Address.
I tried to change the speed and duplex setting to 1000base, 100base, 10base and half and full but neither of these helped and still I get the message "Cable Unplugged" when trying to connect to router.
In system information I don't see a problem with Ethernet card and the information is as follows:
Name:          ethernet
Type:          Ethernet Controller
Bus:          PCI
Vendor ID:          0x14e4
Device ID:          0x16b4
Subsystem Vendor ID:          0x14e4
Subsystem ID:          0x16b4
Revision ID:          0x0010
Link Width:          x1
BSD name:          en0
Kext name:          AppleBCM5701Ethernet.kext
Firmware version:          57765-v1.37, 0x7287af41
Location:          /System/Library/Extensions/IONetworkingFamily.kext/Contents/PlugIns/AppleB CM5701Ethernet.kext
mDNS offload capable:          3c:07:54:07:d0:d4
Version:          3.2.4b8
So I'm having the problem in different settings, with different routers and in both Mac and Winsows. I have done restarts, shutsowns, PRAM SMC resets and none helped ( neither for the ethernet problem and nor for volume and sleep problems I'm experiencing) so I'm considering reinstalling my OS X Lion. But I'm afraid it is a hardware issue because power fluctuations or something.
I appreciate any suggestion.
PS:
1.My MBP has experienced a falling down but I had no specific problem that I can relate to the strike. Also I had no problems with Ethernet after that.
2.I have a faulty Magsafe adaptor that has a corroded cable but it keeps charging and I'm waiting for my new Magsafe adaptor.
3.Newly I have a weak maximum volume on my Mac and volume fluctuations, also some weird sleep behaviours and delays in sleep.

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Macbook Pro (Lion) won't recognize Ethernet cable

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