Router won't stop rebooting...

I have a Netgear R6250 that I bought a while back. I bought it because the WiFi signal I was getting from my gateway from Comcast was absolutely pitiful. I figured maybe buying a router of my own to use instead would solve this problem. Nope. Didn't do squat. We went back to just using the Comcast gateway instead.

Fast forward to today (two years or so?) and we got the X1 gateway that was supposed to increase performance all around due to being dual band and all that. Well, once again, it doesn't do anything. I'm getting 5mbits/sec down and .22mbits/sec up. Hook it up to wired and I get 125mbits/sec down and 24mbits/sec up. I know you're supposed to lose speed when using WiFi versus Ethernet, but this simply cannot be right.

I grab my Netgear (which was boxed and everything), plug it in and go to set it up. I almost immediately run into an issue. It won't stop cycling its power. I figured maybe it was the power adapter. Nope. I tried several different kinds of the same or more voltage and it would still cycle its power shortly after it started to boot up. I even reset it to factory settings because apparently a firmware update was out there that could cause this issue. I dunno if I had that particular firmware, but I did a factory reset just in case.

This thing was used for all of 5 minutes and that was it up until today. Does anyone have any idea what could be causing this? Any suggestions/information would be greatly appreciated.