First, check that your batteries are in properly. Next, it is important to make sure the contact of the battery with the device is clean, as this can cause problems with battery operation. If these two things do not work, try using the A/C adapter cord. To do this, plug it into the radio and the wall and try turning it on again. If this also does not work, it is possible that the FUNCTION switch is broken. It may be helpful to see a full description of probable issues and their repair guides on the Troubleshooting Page.