Acer Altos R5250 - Manual (Page 105)

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Resetting the system
Before going through in-depth troubleshooting, attempt first to reset
the system using one of the methods below.
Perform Purpose To do this
Soft boot
reset To clear the system memory and reload
the operating system. Press Ctrl+Alt+Del
Cold boot
reset To clear the system memory, restart
POST, and reload the operating system.
This will halt power to all peripherals. Press the system
power button off
and then on.