47FAQ and troubleshootingAppendixFAQ and troubleshootingThis section lists frequently asked questions that may arise during the use of yoursmartphone, and gives easy answers and solutions to these questions.Aspect Question AnswerAudio Why is there no soundcoming from thedevice?If the headset is plugged into the device, thespeaker is automatically shut off. Disconnectthe headset.Check that the device volume setting is notmuted.Check that the volume control is not at itslowest setting.Multimedia files Why can’t I view mypicture files?You may be trying to view an image that is notsupported. Refer to "Supported formats" onpage 35 for more information.Why can’t I view myvideo files?You may be trying to view a video that is notsupported. Refer to "Multimedia" on page 53for more information.Why can’t I play mymusic files?You may be trying to play a file that is notsupported. Refer to "Multimedia" on page 53for more information.System informationand performanceHow do I check the OSversion of my device?Tap Menu > Settings > About phone tocheck the OS version (Build number) andother hardware and software information.Power I couldn’t turn on thedevice.The battery power may be depleted. Rechargethe device. Refer to "Charging the battery"on page 10 for more information.RAM / ROM How do I check theRAM and ROM memorystatus?To check the ROM status, go to Settings >storage.To check RAM status, go to Settings >Applications > Running services.Unlock pattern I forgot my unlockpattern.After a certain number of wrong entries, youwill be presented with an option to reset yourpattern. Tap Forgot pattern? and enter yourgoogle account username and password.Note: You must have an active Googleaccount on the smartphone.Alternatively, you restore your smartphone tofactory settings. See "Restoring to factorysettings" on page 43.