[CBThorne]

My Curve 8520 won't make a sound for calls, texts, e-mails or my alarm clock even when it's on sound profile Loud.

I can make phone calls and I can listen to music on the speaker no problem.

What the hell?

[aiharkness]

Sounds like you've checked your profile settings, and they didn't all mysteriously become set to mute. Right?

How about trying a hard reset? With the power on, remove the battery for at least 30 seconds. Then test.

[knottyrope]

if on OS 5.0.0.882

KB24307-Ringtones and alerts do not play regardless of the tune or volume setting

[david9962000]

Yep, I had the same problem so I'm using Vodafone OS.