Hacked Ender-2 SD card problems (no replies)

I bought a cheap chinese printer, "Ender-2". The first thing I did was offcourse to replace the stock firmware (the supplied one was pre-installed without source). After many hours of work I've figured that the mainboard was a MELZI compatible, and defining LCD as MINIPANEL seems to work. However I have an annoying problem the the SD card menu is full of garbage-graphics (see attched image). I've tried to fiddle with many settings etc. in Marlin, but I have not managed to figure it out. Also, if I dont have a SD-Card inserted when Marlin boots, the system freezes. Anybody have any clues on why this happens???

[attachment 95556 sdmenu.jpg][attachment 95557 mainscreen.jpg][attachment 95558 motherboard.jpg]