You're probably out of luck.... and have some digging in your future!
It is fairly common for ponduit to be damaged during backfill, compaction, etc. This is particularily true when the pipe was installed by non-electricians, not buried deep enough, clean fill was not used, and the pavemant is subject to heavy traffic.
First I would sugest hooking up an air compressor. You might blow the blockage free. You certainly ought to be able to hear the air exit the pipe.
If you haven't done it already, trace out the line, marking the pavement as you go along. It is possible that there is a buried splice box. (See "A well buried box" in the picture forum).
