Here is the error in the log file:

TNSLSNR for Linux: Version 10.1.0.5.0 - Production
Log messages written to /home/Oracle/PROD/apps/tech_st/10.1.2/network/log/apps_prod.log
TNS-01151: Missing listener name, APPS_PROD, in LISTENER.ORA

For some reason your listener.ora is either missing or corrupt.
I did not see any error in md5sum output as well.

May be the following log file will give a clue:

/home/Oracle/PROD/apps/tech_st/10.1.2/network/log/apps_prod.log

You might have to reperform the installation after removing the existing installation.

Please upload the above file. Thanks.