OK i am designing a website for computer sales and i need very specific images of cases that will be sold! just wondering would the case manufacturers give editable images for marketing(etc) their product?

You will need to contact the sales dept of each manufacturer. I have done similar with different products in the past.

If you carry the stock yourself, it's better to do your own photography, so you can have a more consistant look to all of the product photos you have in your shop.