How are you trying to connect? WiFi or Ethernet cord? If it has been that long, you could have a few different things causing the problem. Outdated software for the WiFi. Dead WiFi card, damaged cord (if connected via Ethernet), etc.
If you are trying to connect via WiFi, I would start with checking to see if you need to update anything for it. Drivers, software, etc. If that isn't it, try connecting via Ethernet. If that works, then your WiFi card may need replacing.