Message "no bootable device insert boot disk and press any key" on a hp laptop

coachdave

Honorable
Jun 13, 2012
3
0
10,510
Hello,
My hp laptop was working fine, no problems, then the message 'no bootable device insert boot disk and press any key' appears on my screen. Now, I cannot do anything. Windows Vista is the operating system.
...What happened & how can I fix this???