I have a local WordPress installation in a MAMP server that was working fine and after a period of time without using it I come back to it and I get a HTTP ERROR 500. Couldn't figure out how to fix it so I decided to install WordPress again but after activating the theme it broke again. I also tried a fresh MAMP install and again after activating the theme I get a 500 error.
How can I find what's causing this? I have the theme installed in the client's server and working fine here: http://marilimitado.com/