07/11/2015 at 14:12
Post count: 131
The most common problem, in my experience, is a bad MicroSD which keeps giving I/O errors even after formatting it.
I got RetroPie working like a charm (some MAME titles are slow but still) SNES/PSX/Megadrive all work like a charm and the GBA is also very impressive.
You mention several different installs all fail so my guess is the problem is on your end.
Try another MicroSD (2gb one or 4gb one) and try from there, perhaps you will be pleasantly surprised.