I have an old Tungsten C that was off for several weeks. Today, I couldn't turn it on so I re-charged it. After several hours, I can't still turn it on if its not connected. If it's connected, I can turn it on but after a few seconds, it shuts off. When the screen is on, there's a high tone like the sound old TVs used to make.

The screen seems alright and the problem occurs when the device is plugged, so I have no idea what it could be. Any ideas?