I have several older 3640 routers in use yet. Actually 2 in service and a spare. They have multiple T1 interfaces and I use them to load balance the T1's with MLPPP. Whats weird is when they work they work great and run like months or darn near years without having any issues. I have seen on a number of occasions though when I shut them down to upgrade or due to a massive power failure sometimes they do not boot back up. What I see is the ethernet green lights just flash steadilly. Nothing comes accross console port that I can tell and they just never come to life. What seems to bring them back is killing power for a while then trying again and doing it over and over. After about an hour and a dozen or so attempts like this they come back to life and boot up successfully.
Any ideas what is wrong?M