Here is the original item:
Bored with the revision of his research essay. Patrick poked the soft front
of his flat-screen monitor, fascinated by its squishy surface.
You chose to connect the participle phrase to the main clause that follows, like this:
Bored with the revision of his research essay Patrick
poked the soft front of his flat-screen monitor, fascinated by its squishy
surface.
Unfortunately, removing the period will not do the trick. Review the rules.