Hi guys! I have an aluminum 2008 MacBook. The very first of the aluminum unibody's. For some reason right now, it will not connect to Wi-Fi. When the Wi-Fi is on and selecting the network, the exclamation point comes up in the middle of the Wi-Fi icon. This happens for numerous networks, so I know it is not my network at home. Plus my iPad, android cell phone, and iPod, are all connected to my home Internet without a problem. Seeing that my MacBook is nearly 4 years old, how would I fix this because the AppleCare has run out? Thanks for your time.