Can't run homebrewn DS games!

I've tried with loaders, without loaders, with patches, without patches, and all combinations of the above, and I just can't seem to get DS roms to boot. I'm only using one rom at a time, not mixed with GBA roms or anything like that. I get a blank screen after the initial SuperKey loading screen no matter what game or program I try to use.

Here's what I have:
-SuperKey
-Ez-Flash II Powerstar (512 MB)
-EZ Client 3.26
-Japanese DS Lite

I wonder if it could have anything to do with my JDSL, but I'm hoping not. I've never heard of any region-only DS tricks. I'm assuming I'm missing some vital part of software, and/or I haven't stumbled across the right pattern of loaders and patches. Any ideas?

I'm pretty sure the Superkey cannot boot the EZ-Flash card you may need an EZPass