> What can I do to make it online?
Without knowing more about your platform, it is tough to give a sensible anser, but if we are dealing with M/T/MX, look in the chassisd logs with "show log chassisd"; there should be some hint about what is causing the problem.
On some platforms, you can even try 'start shell pfe direct fpc0' - see if this give you some output.
As always in case of suspected hardware faults/software bugs, I would open a case with the JTAC.. sorry if I am a bit monotonous with this kind of recommendation, but I believe it would be best.
Saverio