My 2wire 1000Hw router keeps restarting

My 2wire router keeps on restarting when I plug it into the wall. The first light (power Light) goes green after a few seconds, then the Broadband link goes green after a few seconds but then the, local network light blinks green one time and the whole process starts all over. I have no chance to go into the settings and reset the router. Also note that if I use the original adapter that came with the router, the router doesn't even turn on the lights. Instead it makes a whining noise, which you can barely hear. So I am using an old phone adapter that works great and actually turns the lights on. I made sure all the connections were good. I also called my ISP which is ATT and they told me that its out of warranty so I should get a new one. Any help would be appreciated, thanks.