I delete os x and i closed the computer and when i try bring it back

[juanitadixon34]

i delete os x and i closed it by accerdent and now when i try strart it up by the commened buttom r it show me a blinking flies

 

[juanitadixon34]

MERGED QUESTION
Question from juanitadixon34 : "deleter my computer"

how to bring back my apple mac book pro to factory setting when i didn't back up files and wip it clean . and also set it down and didn"t compet the process

 

[kenrivers]

What is the year and model of your Macbook?