You need to contact that repair company that serviced your computer and have them fix the issue free of charge. Time is of the essence as many companies have a limited policy about service done to computer.
It seems you should have a bone to pick with "IT Guy" but maybe you just don't trust him to touch it again.
The manual is online and should illustrate what connects where.
http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&cc=us&dlc=&product=362754&lang=
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