Hello everyone! thank you for your answers (Sorry about my English) before few days I load files to my KORG pa800. The files were probably not appropriate. As a result, the organ was stuck all the time during its start-up and could not be used. I asked what I should do and they told me I had to do a factory reset. I downloaded the reset files here: http://www.korgpa.com/support/products/arrangers/pa800/pa800-software.html I've uploaded the file "Pa800_Format.pkg" and acted according to the instructions and then i load the file "Pa800_os_res_v203.pkg". After I turn off and turn on the device at the end of the process, the logo appeared and then a white screen. Where I went wrong? What's the problem? Thank you.