hi Vivek, this issue is solved after i change to boot external DVD rom from front to back USB, it can boot the OpenManage DVD. That 's not make sense, but it 's work, thanks for your help!!!!   
Dear All:     I can't install windows 2012 on R720 xd, because the lifecycle controller doesn't show windows 2012 on the list of OS deploy even i update it to ver 1.1.8.1. And i try to install windows 2012 directly, but it can't detect that is installation cd..... . I tested the cd which can boot on vmware successfully, how can i do?
Can't install windows 2012 on PER720xd