Is there any mistake in these sentences?

When Judy went up the stairs, moving her PC and radio-cette recorder from the communal dining room to her room around noon, Paul got out of his room. She brought the radio-cette recorder to her room first, leaving the PC on the stair, and came back to the stairs to find him on the stair. He held his foot over the PC for about ten seconds, staring her face. Since then the PC cannot be powered on because of deform of the AC adapter and the DC jack.