simon: Try the MicroSD card in another card reader and see if it works. Or try a new MicroSD card in Elonex and see if it works. I don't understand how so many people are having problems with it. I've had only 1 problem and I caused it. The lock button broke. I had to super glue it back now it's better than new 😀 The only real problem with this is reading PDFs is a real pain, but this is because of how PDF is. If you got a file in .PDF .TXT, .HTML, .CHM etc use Calibre to convert them to ePub. 511EB reads ePubs perfectly. (You will have problems with conversion from PDF, because it's a pain to convert from PDF)