The one I'm looking for is kind of hard to find.
The plot, at least what I can remember, is this kid is trying out a new computer game, when one of the characters comes to life and zaps him with lightning leaving a scar. The kid must then go on to defeat other characters that come out too while keeping the whole thing a secret.
The cover shows the lightning guy phasing out of the monitor, an old CRT type which was cutting edge around the time I read this being circa '98, firing a bolt at the kid who is falling back in his chair. The kid is also a nerdy looking individual with huge glasses, and a scrawny frame.
Any help is appreciated as finding this has been killing me for the past year.