Getting blank pages, why?

[dropbop]

Hi,

I seem to be getting blank pages on my site.

1st time i noticed was when I tried to add a product to cart (not logged in)

2nd time was when at shopping cart page and I clicked 'Checkout', just got a blank page.

3rd is when I log on as a buyer, enter login user and pass and then get blank page (using back button i see I am logged in)

4th is when i move from step 1 (delivery info) of checkout to step 2 (payment method).

I installed using Fantastico Delux as I have always done on many other zen sites and never once had a problem, and all on the same server.

If anyone has any idea of what might be causing this or may know how to resolve it, I am all ears.

Thanks guys

DB

Site address: www.theladywants.com/store/