I have a refurbished PC with no OS. The first time I started it, it said there was no boot device. I put a Win2000 installation CD in the drive and it booted. I installed Win2000 using all of the defaults. It boots if I leave the CD in the drive, but it says there is no boot device when the CD drive is empty. Three or four years ago I might have known what to do but today I'm completely stumped. Any ideas?

Thanks,
Sixto
95 S420
91 300SE
87 300SDL
83 300SD