So you can afford to go to grad school... the field of biology would love someone with a computer degree. All the species affected by global warming, studying them requires lots of computer assistance out in the fields, jungles, oceans, mountains. You could specialize in one area, such as marine biology with good computer knowledge of the equipment. Biologists often have to troubleshoot equipment out in the middle of nowhere. There's even a small chance you could get work on an expedition before grad school, even if it's without pay, and then go to school.