Volume controls suddenly became disabled. What could happen?

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4.0-ice-cream-sandwich volume-control prestigio-multipad

                          Most of volume controls on my  PRESTIGIO PMP5080CPRO  android 4 tablet became disabled (all except alarm volume control). And there are no sound except alarms. What could happen? How can I enable them ? I haven't installed anything recently. Here are screenshots:

Screenshots (click images for larger variants)

Asked by HongKilDong (111 rep)

Dec 3, 2013, 09:14 AM
Last activity: Dec 3, 2013, 11:49 AM

Volume controls suddenly became disabled. What could happen?

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