1. Check that the hard drive is in securely.
2. Save any information to a SD card or other memory device that you wish to keep and reset/format the system.
If both of these don't work send it back to Sony for repair.
For the internet.
1. Check that it is set to use the proper connection type Wired/Wireless.
2A. If wireless, check that the router is set up to use the PS3 and that the PS3 has the proper passwords for any protection you have(I use Mac addresses and a WPA)
2B. If wired, check that it is plugged in securely from both ends.
3A. If everything is set up properly and resetting the router does not work, something is either wrong with your router or wrong with the PS3's wifi card. Does your router work for other devices?
3B. If plugged in properly and PS3 is set to use wired and it still does not work something is wrong with the systems LAN or your router. Does the router work for other wired devices?
If you need help with router settings, I'll happily provide it if you send me a private message.
If none of this helps, contact Sony for repairs or tech support.
