PRS-500 weren't supposed to be charged by AC to USB... probably incorrect data info conditions on connector as a result leading to the usual battery drain to flat condition... There is a specific barrel connector hole in the base for connecting a PSU... normal is PSP 5V PSU, cheaper than standard Sony PSU and works... other choice is USB to barrel connector cable then plug that into PSU socket...
Your little yellow flash relates to an attempt to access the flash memory and, again, this is typical of a totally drained battery... especially that caused by connecting an incorrect unit to reader...
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