Mail Client Crashing, Mac Messenger won't connect, 1 USB port won't work!!!

Any ideas on why my macbook pro has the above probs.....Wen I open mail and click on a message, Mal just crashes and gives me a message to relaunch. MSN won't connect no matter how many times i reinstall it and my son decided to unplug his Ipod from the usb port and now anything i plug into the port isn't recognised.......Pleeeeeeaaassseeeee Help!!!!! TY

Both cables (Cat5e and Cat6) that I used was tested with my WD live hub and worked at 1 Gbps. The Cat5e is not shielded and I'm fairly confident the Cat 6 cable is unshielded as well. I should mention at this point that I've made my own network patch leads for over 10 years now and my networking career started out using coax cables. I would say that I know what I'm doing and can concluded with 100% certainty that it is not the cables.
After installing Windows 7 through Bootcamp there is not even an option in the network adapter setting to set the speed any faster than 100 Mbps.
After going to my local Apple store (30 Km away in London!) the genius I spoke with suggested I book a slot and bring it in for them to test to determine if a new logic board should be ordered. I must be honest, I thought however I spoke with would treat me like an idiot and try and blame anything but the mac but she listened and agreed with my assessment and suggested I bring it it for a test.

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