The router is no longer power. when i plugged-in the power lights will blink in second then died.

With the unit plugged in and on, push the reset button for 30 seconds, and while holding the reset button down, pull the power supply plug out of the unit and keep the reset button down another 30 seconds, and THEN (still holding the reset button down) plug the power supply plug back into it and keep the button down for another 30 seconds.

That's a "30/30/30 Reset", and it should boot up fully reset.

If the Power or Diag LED (Light Emitting Diode) on your Linksys router is blinking, it means the firmware is corrupted. If this happens, you won't be able to do the following:
• Access the router's web-based setup page
• Assign IP addresses to computers connected to your router using its DHCP capabilities
NOTE: This also applies if your router's LED is dimly illuminated.
Listed below are the things that you can do to solve this issue:
Powercycle the router
Assign a static IP address to your computer
Ping the router
Reset the router
Update/Re-flash the firmware using the TFTP utility

If the power light is blinking then you can try to reset the router.
Press and hold the reset button on the router for 30 seconds. Release the reset button and wait for 30 seconds. Unplug the power and plug it back in. Wait for 30 seconds.
Check the status of power light on the router.

A Blinking Power light on a wrt-54g usually indicates that the firmware is corrupt. You can try to wipe the firmware by following the steps below:

unplug the router
using a paper clip or pin, press the reset button
plug the router back in while the reset button is still pressed down and hold it for 30 seconds.
once you let go of the reset button the router should go through a reset. if it still blinks try the process again.

if the issue still occurs then it may be bricked.

Is the power light on the router blinking ?
If the power light is blinking and the WLAN light is not lit up then you will need to reset the router.
There is a small reset button on the back side of the router, where you connect the cables.
Press it and hold it down for 30 seconds. You will need a pen or paper clip.
Release the reset button and wait for 1 minute. Make sure that the power light willl be solid on the router.
Once the power is solid and steady, unplug the power cable of the router. wait for 5 seconds and plug it back in.
When you reset the router, it will come back to the factory default settings and you will need to set up the router again.
Click here for step by step instructions to set up the router.

Welcome to FixYa
Indication of Router Lights:

• Power light blinks. If LAN or WAN cable is plugged in, their respective lights will flash on activity.
• Power light turns off for several seconds.
• All lights, except power light, turn on and then off.
• Power light blinks slowly, then faster, and WLAN light will turn on.
• Once Power light and WLAN light are on solid, the router is fully rebooted.

A working router should show solid green power light. upgrade the firmware of the router.
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Was there any power flicker before it happened?

1. Reset the router by pressing the reset button of the router for 15 seconds while the power cord is plugged in and while the router is powered on.
2. Release Reset button after 15 seconds and unplug the power cord of the router then press the reset button again for 15 seconds.
3. After 15 seconds release the reset button and replug the power cord then press the reset button again for 15 seconds.

If this didn't work.
1. Plug the power cord to the router, and unplug it do this 7 times then reset for 15 seconds while it's unplugged and plug it back it and press the reset button for 15 seconds and release it. Try to check if there's any changes.

If the power light is blinking on the router , then it might not be working properly.
You will need to press the reset button on the back side of the router for 30 seconds. release it. unplug the power cable. plug it back in. wait for a minute and check if the power light is solid.
If not then try to reset the router again.
do the same thing and check if the power light is solid.

If the power light is solid then you will need to set up the router again.
If the power light is still blinking, then connect the computer to the router and check the IP address on the computer. If the IP address is 192.168.1.100 then try to open the set up page of the router and check the settings of the router.

Click Here for step by step instructions

Also check if the power light on your router is blinking. If it is blinking, that's an indication of hardware failure. To revive it, do a hard reset. Press and hold the power button of the router for 30 seconds then unplug the power. Wait for 30 seconds again before you plug it back in.

Try first to reset the router, Press and hold the reset button for 15 seconds then after that power off the router wait fro 5 seconds then plug it back and check if the power still blinking if still blinking you can call Linksys tech support and ask assistance if still under warranty ask for replacement this is the number for Linksys 800-3267114

Hope that helps...........