Mobiblu dah 1500i

The new player needs to be charged overnight for the player will work on the battery. You may need to do this a few times after the battery runs down.

try to restet in and try again

Here is the cd software.
Here for all the available files for the mobiblu cube dah-1500i from the manufacturer.
Use google translate to understand what they mean.

let the norton2010antivirus scan the player or the memory card provided, some of the msi of the system might be hidden.after scanning, restore factory defaults..

have you tried turning it up or seeing if your headphones work right?

I formatted it with windows 7 and it read "no file" even with songs on it. Then I formatted it with windows XP and it worked!

Try the Mobiblu America site, they offer repairs

Downloader the firmware updater from the mobiblu site
Install the software, connect the player via the USB cable, set the switch to hold and run the updater. When it is finished, stop the device and disconnect it. When you power up, it will be back to factory settings (any data/music will be erased).

verify the files using your pc. try placing them on the root (no folders).

FYI, my mobiBLU DAH-1500i 1GB unit wouldn't boot. It would start up the musical note logo and stay there. I had to hard-boot it with the little reset button. Then I connected the USB cable and "unloaded" all files, then used Windows to FORMAT the drive (FAT32). After that it fired right up and works fine. I might try to update or reinstall the firmware if it doesn't keep working. Good luck.