The DMP-400N is just a wase of time, reinstall the software and then once it talking to your PC Reformat and then try puting your music back on , this will slove the problem ,as long as the DMP-400 is talking to the pc your ok, once you disconnect then you back to the same old thing, The 400 has got a software Problem
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Try recharging the battery if the MP3 player is not turning on. To recharge the battery, connect one end of the USB cable to the USB port on the MP3 player and the other end to an open USB port on your computer.
Press the "Menu" button if the player keeps turning off periodically. Select the "Settings" option in the Menu and select "Power."
Select "Auto Power Off" and turn off the sleep settings.
Try turning the player back on. If it does not turn on, perform a reset. To do this, press and hold the "Power/Menu" button for at least 15 seconds.
You will need to get the sansa media converter ...once you have it on your computer you can convert the videos into the player format..once you do so you should be able to transfer them.. I hope that helps.. Thank you Computerrep
Mine did the same thing. What I did, and it worked well for me, was I went down the menu until the Settings, then clicked that and went down until the Power Off section. I clicked that and went to Sleep Time, and held the right button down until it was set to 240 (I think that's what the highest # is). That keeps it playing for 240 minutes, after which it automatically shuts down to save power. You have to reset this every time you turn the mp4 player back on.
Ensure the key lock is not activated by sliding
"Power on/off ( )/Hold" towards the center
position. If your player isn’t already on, turn it on by
sliding "Power on/off ( )/Hold" to the left
and holding until the player turns on.
These are the most common methods for recovering Sandisk's Sansa Mp3 Players. I have been almost universally successful in recovering Sansa players using one or a combination of these methods. These methods do not work if you are having synchronization or music format issues - they are for recovering a player that will not power up, freezes, flashes, is not recognized by the computer, and a host of other issues.
Reset the Sansa Player first.On most models, restart is done by holding the power button in for 15 seconds or longer.Check your specific manual to be sure. The manuals are available from the Sansa website if they have been misplaced. Download the Sansa Recovery Tool from the Sansa website. Format - Erases Everything: Connect your Sansa player to the computer and open Windows Media Player. Click on the Sync tab. Pull down the drop down menu underneath the Sync tab by moving your cursor over the Sync tab and left clicking on the little black arrow underneath the Sync tab. Highlight "Sansa 1GB" (wording may vary slightly), and then select "Format." - this should erase everything. Firmware Upgrade- Erases Everything: Get the latest firmware upgrade from Sansa - it updates the firmware and erases every song in the player all at once. Note: this method doesn't work if already have the latest firmware. Go to this website and click "Firmware Updater" to find out: http://www.sandisk.com/DriverDownload/driverList.asp If these fail, then: Try this: disconnect the player from the computer, turn it off, hold in the volume + button, and reconnect the player to the computer while holding the volume + button in. Keep holding the volume + button for an additional 5-50 seconds. Windows should eventually go into recovery mode and revive the player- it will pop up a window that says Found New Hardware Wizard. If you get the problem where MTP Device keeps popping up continuously, uninstall the “MTP Device” by going to Start à Control Panel àSystem à Hardware à Device Manager (you computer may vary slightly, depending on Windows Version). You may have to restart your computer after each of these methods to get them to work properly. Disconnect your Sansa player BEFORE shutting down your computer. -Tha Mp3 Doctor