Lenovo ThinkCentre 7515 Maintenance Manual page 84

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Hardware Maintenance Manual
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.