just got a new toshiba e740 from a friend and when i go to use the built in wifi feature, i turn the swith on, and for a few seconds is will say in the top right corner that is is on (wifi) but then it will have an "x" which indicates that it is off...i need help with this. another thing is that i heard that i can put a usb port on this, how because i am extremely interested in this.