I bought my MacBook Pro in May of 2010 and I've never had any problems connecting to the internet at my house. Last night, my charger wasn't working and my computer ended up dying completely. When I managed to get it turned back on, the date and time was incorrect and it made me re-enter my WEP password for my network. I reset the date and time manually and re-entered my WEP password multiple times correctly, but it keeps saying "Alert: No Internet Connection". I've restarted, turned Airport on and off, run network diagnostics, and moved System Preferences to my desktop and nothing has helped. It works on my school's network. Also, my HP desktop computer internet works fine and they are on the same network; usually, both of them will either be working or not working at the same time. I'm getting really frustrated. Help please?? 
