Post count: 13

Just saw your other post, so I guess you already know about the wad files.
So here is something you could try, this is what I do to troubleshoot.

Get the raspbian wheezy image
and write it to a new sd card. then you can use this to test emulators independently,
for prboom
sudo apt-get install prboom
mkdir doom
cd doom

copy the doom.wad file to the doom directory you just created
make sure your working directory is doom.
type prboom

You may want to download putty to access the pi from a pc, it makes it easier and you have access to the command line when ES is running