I think I know the answer but I wanted to see if I am right. I charged my PRS500 overnight then I was half charged. When I turned it on it rebooted. I came to the first arrow-circle thing then it shut off. When I try to turn it on I get a flash of yellow light by the power switch. Also when I plug it in via USB I get that too.
Think the battery got drained and I need the AC adapter? I am just worried and going through withdraw without my reader.