My sansa Fuze+ won't power up at all. It powered up once, and froze. I tried turning it off and back on, and now it won't power up at all. I just updated my playlists yesterday, so pretty sure it's not a battery issue, but it's not registering at all on my computer if i plug it in. I'm out of ideas.

Push the power switch up as far as it will go and see if the blue ring on the front of the player lights up.

The Fuze's power button is not a traditional button but a slider, so if you did not push the slider up all the way, this may be the only reason it was not powering on.

Reset the Fuze by pushing up on the power switch and holding it in the up position for 10 seconds.

Try to power on the Fuze again after it has fully rebooted.

Connect the Fuze's USB cord from the Fuze to a USB port on your computer.

You should see a yellow charging light illuminate and the battery symbol blinking on the Fuze's main display.

Once the battery stops flashing, the Fuze is fully charged and you can try to power it on again.

hope this helps

One issue that people experience with the Sansa Fuze player is that the screen turns white when they are trying to use it. If you experience this common Sansa Fuze MP3 player repair issue, you need to reset your player. Hold down the "Play" and "Power" buttons for about 20 seconds. The player should automatically reset.
MP3 Player Freezes

Another issue is that the player freezes. You may see lights on the player, but it won't do anything. Follow the below steps to correct this issue:

1. Use the above steps to perform a hard reset.

2. Turn the player back on, and slide the "Power" button upward.

3. Use the USB cord that came with your player, and connect it to your computer. Only connect your player directly to the computer. Don't connect it to a USB hub.

4. See if your computer recognizes that a device was connected to it. Or, look in "Devices and Printers" folder, and see if the device shows up in it.

If your device doesn't reset, and the computer doesn't recognize it, contact SanDisk for additional assistance. Or, you can attempt to repair the device yourself.
Repairing Internal Components

If your Sansa Fuze player is out of warranty, you can attempt to repair internal components. This is an "enter at your own risk" solution, but you may be able to fix the issue. If it doesn't work, or if you damage another component, you will most likely need to get a new player.

1. Shut off the device.

2. If you don't have one, purchase a case opener tool. This is a tool with an extremely small head that is used specifically for opening up small devices.

3. Place the head of the tool in the seam of the device, and rise up the faceplate. Do not do this forcibly, or you'll break the ribbon cable connected to it.

4. Remove the ribbon cable from the faceplate.

5. Examine the battery cable. If this connection is loose, your Fuze player won't turn on. Plug the connection firmly into the port.

6. Check the LCD screen connection. A loose connection here means that you can't see anything on your screen. Disconnect the cable from the port, and reconnect it.

7. Reattach the cable to the faceplate, and reattach the faceplate. Turn the device back on.

These Sansa Fuze MP3 player repair suggestions may not fix all issues. If your player is still not working properly, either take it back to the place where you bought it, or contact SanDisk for additional help.

References

Fixya.com, http://www.fixya.com/support/t4267400-sandisk_fuze_4gb_locked_lights_will_not

SanDisk, http://www.sandisk.com/products/sansa-music-and-video-players/sandisk-sansa-fuze

hold the power switch to on for about 20 seconds

Slide the power switch up all the way and hold it there for ten or fifteen seconds to reset the unit.

try holding the power slide/ button type thing in the on position until it turns off, then try turning it back on...

try holding the power button up for about 20 seconds and it should reset it and then it should work just fine again

when switched off,plug in the MicroSD again and let it startup...if it starts up well and good...turn it off and only then remove the microsd..the try turning it on...

Try holding the power button for 10 seconds to do a soft reset.

hold the power button for a long time

Reset your Fuze by holding the power slider switch in the "On" position for 15-30 seconds. Release the button once the unit begins to power down.