I was unable to get startup manager to choose startup disk at restart by pressing Option button, couldn't reset PRAM by command+option+P+R. I am able to select startup disk in System preferences but then noticed that there is no Recovery partition in the menu and unable to get it by command+R at startup either. I reinstalled osx (Mavericks) but that didn't help anything. Then I thought that may be I am missing Recovery partition as I tried to clone bootable image on SM951 last year and I need to recreate it. So I made a clean install of Mavericks on an empty drive and booted from that drive but again noticed missing Recovery room partition and other problems continue to exist. I came across this article https://www.lifewire.com/create-os-x-recovery-hd-on-any-drive-2260909 on google search and tried to enable Debug menu on Disk Utility as mentioned here https://www.lifewire.com/enable-disk-utilities-debug-menu-2260807. But that didn't work either. I think it is time for experts to jump in as I am not a computer geek. I'll really appreciate if you all can guide me what to do.