Router's Error

Last night, one of company's routers was down, so, the network would be down too. No body knows why, including me. :P
My colleague called me at 11 pm when I was trying to get some sleep. Ready or not, I got to go right away to recognize and fix the problems.
When I got there, everybody looked stressed. Every phones in the room were ringing all the time, almost. I stood in front of one pc and trying to telnet the router. Can't get in. I grab the console cable, connected it to the router and trying to fix the problems.
The funniest thing is the network is back to its normal operation, while I was trying to connect to the router. Trying to figure what was going on, everybody in the room congrats me for the success. I didn't do anything, I told them. No body believes me. Till now, I still figure what was going on that router. Still don't get the answer.