The fragment is "Whenever the color tint flickers from normal to sickly yellow"
It should be changed into "Whenever the color tint flickers from normal to sickly yellow, [DETAILS]"
With her heavy dictionary, Donna thumps the top other ancient computer monitor. Whenever the color tint flickers from normal to sickly yellow.
The fragment in the sentence is "Whenever the color tint flickers from normal to sickly yellow." To correct it, you can combine it with the main clause to form a complete sentence.
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