Welcome to mobileread !
Here is a list of thing you can try
- Try these links and see if they help you:
(warning: these methods might format your internal memory so backup your books)
link
link
- If you can find a psp charger or 505 charger with the yellow plug you can try using that to see if that kicks it out of charging mode.
- Try to contact sony and send it in for repairs.
- As a last ditch(very last ditch attempt, try the various reseting modes a few times to see if they help you) attempt if you can't send the 505 for repairs try opening the reader and unplugging the battery for a 30 seconds then plug it back in.