Woocommerce now working Plugins Active 500 Internal Error

Hi, I’m sorry but I’m not sure where to start to figure out the problem. This is what I’ve done so far.

I’ve tried installing WooCommerce today on my site and it doesn’t seem to be working with any other Plugins activated. If I try and activated WooCommerce with other plugins active I get the 500 Internal Error.

To get the site back and I’m not sure if this is right but I’ve renamed the Plugins Forder and the .htaccess file for the website to load. As I said, I’m not sure if that’s the right thing to do but it seemed to work. Then I’ve activated one at a time the plugins and then tried to activate woocommerce but still the 500 Internal Error.

I did notice I must have installed the WooCommerce previously as an experiment so I did some reading and deleted woocommerce with:
define ( ‘WC_REMOVE_ALL_DATA’, true);
in wp-config
and it certainly seemed to delete anything old and with a new install of WooCommerce it brought me through the fresh setup.

Still activate WooCommerce and activate another plugin 500 Internal Error.

So, I’m wondering could I have a conflict someplace (well, I guess obviously) but I’m not sure where I would go to try and start figuring out where that conflict is…. Could it be a problem with the database?

If anyone can point me in the right direction to get started in figuring it out that would be great.

Also, I should add.
Everything is updated:
Wordpress 4.7.4
WooCommerce 3.0.5 and I tried 3.0.4
None of the plugins will work, tried them one-by-one, but for example:
Gravity Forms 2.2.2
Revolution Slider 5.0.7

Also used theme 15, 14, 13. Deactivated my other themes.

Thanks in advance!