Chosen Solution
I dropped my Sony Walkman NWZ-B143F into the water and now i am unable to turn it on. But when I turn on my computer, the LCD screen still lights up and say that it is charging and i am able to transfer music.
Bob the builder, the very first thing I suggest is that you stop using it and remove the battery. The more you try to start and sync the greater the chance of causing a short circuit. After that, disassemble your walkman and clean everything with isopropyl alcohol and a soft brush. That will remove the debris etc. Once you got it cleaned, replace the battery and reassemble. Water damage is the toughest to repair and diagnose. Hope this helps, good luck