Not sure what really happened, but it appears that my ASUS 500g Premium router is frozen. Was working fine yesterday, but not today. LAN 1, 2, 3 and 4, and WAN lights are all on. Power and AIR lights are not. Have tried resetting the ezsetup and restore buttons, unplugging, etc., but the router is unresponsive. Has anyone encountered this problem before? If so, how do you fix it? Thanks for your assistance.

SOURCE: exactly ASUS WL-500g, no internet connection

My advice and personal experiences with both wired and wireless connectivity, is if you wish to share files and internet connection, purchase a combined Modem/Router and not a seperate router to work along side your original modem. Your modem will send your router an ip address in turn your pc is sent one from your router and can get complicated; keep it simple! These are much easier to set up and control as one unit and if there are ever any connection problems you will know it's either a setting or a modem/router problem and not have to wonder ; is it the modem?; Router? settings? etc. As there are frequent loss of connections both internet and LAN it makes sense have one peice of equipment to maintain.

SOURCE: Assus WL-500gP router hangs

I had the same problem and found the solution here (last post):
http://wl500g.info/showthread.php?t=11077

Short answer: "the power supply is faulty"

SOURCE: air and power lamp is off, but all lamp LAN and

If you already reset the device by Pressing the reset button of it for 30 seconds while power is ON and still doing the same thing, this is already a sign of a bad hardware so if its still under warranty better have it replace.....

SOURCE: my asus wl - 520gc router just stopped working.

the power source of your router does not deliver the needed current (1Amp) to yoru device. Try to replace the power source of your device (just borrow one from a friend) and test it out. I had same problem with an ASUS router. The router itself should be ok, only the power source has an issue.

SOURCE: PROBLEM WITH ASUS DSL-N13 ROUTER, ALL 4 LAN PORTS

disconnect everything from the unit, then reconnect power.
If the unit behaves normally, start plugging things back in until it goes nuts again.
Whatever you plugged in last is the problem.

If the unit behaves the same, either your power adapter is failing (use a volt meter to check) or the router will need to be replaced.

Testimonial: "YES, YOU ARE RIGHT... THE 12V POWER ADAPTER IS BAD..... IT IS FUNNY, I HAD JUST 3V AND IT MADE THE LED'S BLINK FAST. THANK YOU VERY MUCH FOR YOUR HELP"