you need a case popper. Get what I believe is called a spring clamp from a hardware store
or Home Depot, Lowes. etc. It's like a steel clothes pin on steroids. Typically they
have orange rubber on the handles, bigger ones are bright green. You get it in the space
between the 2 case halves and pry them apart. It might mar the case a bit (it's been
over 15 years since I cracked a Mac I think). Oi kids.