Cant boot without removing dvd drive from laptop

Hi all, I have a dell xps15 2010 model. Couple of months ago I wanted to upgreade the ram and I inserted a different frequency ram in the slot. From then I havent been able to boot the laptop with the dvddrive inserted. I have to remove the dvddrive or put a tape over the sata connector to get the laptop to boot. 

I never upgraded the ram and still running the stock ram but after that once accident I havent been able to use the dvd drive. I even bought a dvd caddy and checked. The laptop still doesnt boot when the caddy is in.

Not sure what the issue might be and how to fix it.

Thanks.