Mega128 ADC Gain problem

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#1
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Hello,
I use a Mega128 with A/D Converters with differential inputs. Normaly I use a 10x Gain.
Now I tried to change the gain from 10x to 200x, but the input value is still the same as before. Can anyone help me? I only changed the ADMUX value.

Thanks,
Tappo

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What input voltage is being measured? Is the input voltage times the gain greater than 5v? If so, the gain is too hi. Was this the problem?

Imagecraft compiler user