UNIX SCO release 5.05 system does not boot

UNIX sco release 5.05 system does not boot:

cannot open device hd(40)/boot
stage 1 boot failure: error loading hd(40)/boot

what to do?

There's a forum for SCO !

thank�s

Your hard drive has failed. Replace and restore from your last backup.

thank�s

Sorry for the short answer this morning. I was using my phone.