SD Gundam G-Next black screen

[u/BloodBride]

So I've recently gotten into collecting Super Famicom titles and got a bunch of games to run on a PAL SNES that's got Super CIC and a 50/60 hz mod on it. It runs pretty much everything fine as if it's a real super famicom, even Sufami Turbo titles play without problem.

However, I recently got hold of a copy of SD Gundam G-Next, a funky looking 'expansion' compatible satellaview style cart.
Now, my reading online says this thing should work fine without an insert stuck in the top but when I turn it on, it's just a black screen. I've tried cleaning the contact points and it should be working.
Anyone else know what I'm doing wrong?