HP Compaq Presario,Presario 5116 Quick Start Manual page 159

A very small portion of the population may experience epileptic
seizures when viewing certain kinds of flashing lights or patterns that
are commonly present in our daily environment. These persons may
experience seizures while watching some kinds of television pictures
or playing certain games, including games played on the Internet PC.
Players who have not had any previous seizures may nonetheless have
an undetected epileptic condition. Consult your physician if you
experience any of the following symptoms while playing games:
altered vision, muscle twitching, other involuntary movements, loss of
awareness of your surroundings, mental confusion, or convulsions.