Question Details:

It is a model WRT54G model version 5. I tried a powercylce many times to stop the blinking light but that doesn't work so I think the problem is a result of something else. The problem started after the Comcast phone/internet modem was installed by one of their "professionals" don't know if that means anything or has anything to do with it but ever since then it hasn't worked.

Answer:

This is caused by the fact that firmware is not loading correctly. The process must be done on a computer plugged into the router directly.
You first need to establish a connection to the Internet and download firmware for your router.

The details are found here.( choose your own model of router when downloading the firmware)