[Koha] OPAC not working

Dear sir/Madam We have installed latest version of Koha using package method, meanwhile we also tried to install the Dspace on the same server, but not succeeded. Now the Koha OPAC is not working. Please help me to figure out the problem and give the solution for the problem. hope i may have the solution soon. Thanking you, yours sincerely Dr. Shankar Reddy