Sony PCG-GR250 - Manual (Page 121)

Troubleshooting Your Notebook
121
2 Restart the notebook by pressing Ctrl+Alt+Delete simultaneously and
then selecting Restart from the drop-down list.
The sound of my notebook’s fan is too loud.
Use the PowerPanel utility to change the Thermal Control Strategy setting to
Quiet. This setting slows down the CPU speed. See PowerPanel Help for more
information.
Why does the System Properties dialog box display a slower
CPU speed than advertised?
This is normal. Because your computer's CPU utilizes some type of CPU speed
controlling technology, System Properties may display the CPU's current speed
instead of the maximum advertised speed.
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If this procedure does not work, press and hold the power button for four seconds or
longer to shut down the notebook.