If you don't have root permissions, you may need your system administrator to unblock the job for you.
Check the qstat -f output and see why the job was blocked. It could be you requested more resources than are available.
In the future specify exactly which node you want (assuming your admin allows that) qsub somejob.sh -l
- If you use a scheduler such as Moab, try the following (again, assuming you have rights ) mjobctl -u mjobctl -l