How do you know that the reset button is not working? When you press the button for 30 seconds or longer what happens with the lights on the router? Do they show any kind of activity that might suggest the router is resetting (i.e. power light is blinking etc.). If nothing is happening then either your router is pretty bricked or the reset button is broken.
After the reset, try to access the router from a computer which is wired to the router. Disconnect anything else including the modem from the router. Power up the router then the computer. Verify your computer gets an IP address from the router. Open a command prompt, "Run..." and enter "cmd", and enter "ipconfig /all" into the window. Look for the "Local Area Connection". Note the IP address and default gateway. The IP address should be 192.168.1.100 and the gateway 192.168.1.1. If not, please copy the output of ipconfig /all (right-click into the window) into your next post.
Try to ping the gateway address. Enter "ping 192.168.1.1" and see if you get responses. If you do, try to open http://192.168.1.1/ If it does not work please write down the exact error message you get.
If you can ping the router but cannot open the link above you may have to flash the firmware on the router again using tftp. See the instructions in Linksys Easy Answer 4573 for details.
When i hold the reset button for 30sec, notting actually happen. I still can access to internet with my 1st PC. But i cant get access to network on my 2rd PC(regardless of wired or wireless). I switch the wire to my 2rd PC, i can get connection but my PC will end up no connection.
This is the result after i check ip and ping 192.168.1.1
This is not the ipconfig output when you connect the computer to the router and disconnect the router from everything else. In the ipconfig output your computer has an internet IP address and has an internet connection. It must be directly connected to the modem or the modem is not connected to the internet port of the router.
Please read my previous post again and post the ipconfig output when the computer is wired to the router and the router is not connected to anything else (no modem, no other computer, only a single computer and the router connected).