trash will not empty

Visit The XLab FAQs and read the FAQ on resolving Trash issues.

You can't empty the Trash or move a file to the Trash

try unlocking the file . Or use trash it app - http://www.nonamescriptware.com/category/trash-it-2/

holding option and emptying trash worked for me

Have you shut down and then restarted the computer? If so, try starting in safe mode