User guide

13
Acorn Risc PC Release note
Correcting your system configuration
It is possible to corrupt the computer configuration settings in such a
way that the computer can no longer be used. This section describes
how to restore your computer to a working state. You'll also find
information about the system configuration in the RISC OS 3
User Guide.
Step 1: Getting to the desktop
If your computer has been configured for a monitor which is very
different to the one actually attached to it then it is possible that no
picture will appear on your monitor's screen.
• Restoring the CMOS RAM.
With the computer switched off, press and hold down the Delete
key then switch the computer on. The Delete key can be released
once the RISC OS 3 initialising message appears on the screen.
This restores the CMOS RAM to the default state and starts the
computer using the normal !Boot procedure.
The !Boot procedure would normally disable the configured
monitor after a Delete-Power-On, and use an automatic detection
mechanism instead to determine the type of monitor attached.
• Restoring the CMOS RAM and bypassing !Boot.
In exceptional circumstances the !Boot procedure will not be
able to turn off the configured monitor setting. In this case with
the computer switched off press and hold down the Delete key
and press and hold down the Shift key too, then switch the
computer on. These keys may be released once the RISC OS 3
Initialising message appears on the screen.
This procedure restores the CMOS RAM to the default setting
and then starts the computer without using !Boot.