crwdns2934241:0crwdne2934241:0 yogi27bear

crwdns2934249:0crwdne2934249:0:

I'm operating my mac off the old hard drive as an external one. the new one that I installed will not reconize the operating system from external one. I do not have the start up disc. how do I get the operating system to my new hard drive?

crwdns2915684:0crwdne2915684:0:

open