Router won't stop rebooting...

You already tried different wall wart. I'd try this, don't connect anything to the router. Power it off >> presss and hold down the

reset button >> power up >> when lights flash, let go of reset button, does it make any difference? Mostly there are two things

can cause symptom like this, over heating or bad power supply.  Speaking if power supply on the router board there is voltage

regulator chip, electrolytic capacitors, etc. Thes component can go bad causing unstable voltage/current on the power rail.  If

no matter what it acts like it, time to open it look inside. Look for suspicous component, check thermal paste under heat sink on

cpu and radio chip, etc.