Asus Eee PC 904HD/XP - Manual (Page 29)

ASUS Eee PC 3-5
Emergency Shutdown
In case your operating system cannot properly turn OFF or restart,
there is an additional way to shutdown your Eee PC:
Hold the power button until the
system shuts down.
DO NOT use emergency
shutdown/reset while data
is being written or read;
doing so can result in loss
or destruction of your data.