Can't boot again to OS/ load system

Power edge 2650, I booted once successful to Ubuntu server installation but the server restarted due to power loss, when I tried to boot in again it got stuck in loading screen after bios. After rebooting again after waiting 2hrs the server could no longer boot into Ubuntu. It has said no bootable device? Trying to instal Ubuntu server 10.0.4 32bit using CD-R. Cd dvd does not seem to be working at all. I tried to instal windows server 2008 32bit and Ubuntu desktop and server again fresh burn. All the CDs seem to stop working for whatever reason.