Ok. I've got a 7206 router with a NPE400 and C7200-I/O-GE+E controller. This unit was removed from service, had installed the NPE400, was left running in our TOC, and sent to me to test before reinstalling. Unfortunately, I cannot access it via the console port. The Ethernet port is not activated so I can't try telnetting to it. I've double and triple checked my serial connections and cabling, reseated all the cards, powered off and back on several times all to no avail. It's no longer under maintenance contract so if I don't figure it out, I'm in big trouble. Any other ideas?
new I/O but also the I/O model counts we had a similar experience with a C7200:
first of all you cannot mount an NPE 400 on a chassis that is not VXR try to check the label on the chassis.
then if the chassis is VXR the NPE-400 is fine.
I would try to power off the chassis, unplug power cable and try to remove and reseat the I/O controller (there is a chance that is not well inserted)
if the chassis is not VXR your I/O controller is not supported see:
So you need to check all these.
We installed for error an npe-400 on a 7206 chassis by using the old I/O controller and it started to experience sudden reloads for bus errors.
I realized with sh c7200 that the chassis was not a VXR !
We had to install an NPE 200 and to give back the npe 400.
Hope to help