If you can access the BIOS menu you should be able to set CDROM as First Boot device, then try starting again with Recovery disc in drive.
To enter BIOS press F2 or Del immediately after pressing start button, this might take several attempts.
Samsung Galaxy S8 review
1995-2015: How technology has changed the world in 20 years
This poetic animation about monsters is illustrated in a Van Gogh painterly style
How to get WWDC 2017 tickets
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.