"She loves to ... with her computer all day."
I found to tinker with and to fiddle with" but they seem to have a rather negative meaning.
I want to express that the person occupies herself with something that she has a passion for but in an informal or unprofessional way. If there is no other word, could I use tinker and/or fiddle without a native speaker having a negative impression?
Update: Playing in the sense of physically playing with the internals of a machine etc.