> No option Central Admin to start it. 

Probably, you are at "*Services in Farm*" page. 
Try to navigate "*Services on Server*" page - *Start* option should be there.

You can also start it from SharePoint Management Shell, smth like:
```
$srv = Get-SPServiceInstance | ? { $_.TypeName -eq "User Profile Service" -or $_.Service -eq "UserProfileService" };
$srv | % {Write-Host $_.Server $_.Status; if ($_.Status -ne "Online") {Start-SPServiceInstance $_}; }
```

Then, go to *Monitoring - Check job status* - filter by *Job Definition*: **"User Profile Service Application - User Profile ActiveDirectory Import Job"** and make sure that this task is completed successfully.

After that, look at the ULS logs. You can filter it by rows containing *UserProfileADImportJob* or *Category*: *User Profiles*. There will be hints to the root cause.