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first try to check if your wireless can actually detect a network, if it can try to remove ALLthe network that you have on your wireless network and try to add your network again, if still doest work try to uninstall and re install your wireless driver, if it still doesnt work try to restart your router, if still doesnt work try to do system restore to the point where your wireless was workin fine, lastly if still doesnt work try to contact your ISP for some configuration.
Sounds like the actual ethernet adaptor (hardware) may be out but first I would run a really good spyware and see if it is infected. This one works really great (see link at bottom) although, it is not free but you can download, installl and it will run scan and tell you if you have malware (which is why it will not connect). It only cost 30 bucks to purchase which is reasonable to take off the malware and get back online. Beats a techs fee.
If there is no sign of malware, then the hardware is out and you will need to replace. These can be purchased at Wal-mart for under 60 bucks. Hope this helps!
I would suggest backing up all you sensitive data and doing a complete factory restore withe the Lenevo disks that came with your laptop. Some of them are stored on the hard drive and you just have to press a button. It should say at start up which it is.