Lenovo ThinkStation S20 4157 Hardware Manual page 95

POST Error Message
Press TAB to show POST screen
Error: Non-System disk or disk error
Replace and press any key when ready
Description/Action
Pressing the TAB key permits the user to
toggle between the default POST display
screen and a custom POST display screen.
The BIOS was unable to find a suitable boot
device.
Make sure the boot drive is properly
connected to the computer.
Make sure you have bootable media.
Chapter 9. Symptom-to-FRU Index
89