Try renewing the fuses, sometimes they can develop a hairline crack that just isn't visible, if that doesn't work, do an image search for "Volvo CR906" and it should show you how to remove it. There's a 5A fuse in the back of it, good chance that has popped so renew that and try it before condemning the radio.
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Cheers
Dave
Next Door to Top-Gun with a Honda CR-V & S Type Jag Volvo gone but not forgotten........
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