Dell Inspiron 4000 - Manual (Page 21)

To program these functions, click an option from the corresponding pull- down menu, and then click OK.
Hibernate Tab
The Hibernate tab lets you enable hibernate mode by clicking the Enable hibernate support check box.
Intel® SpeedStep™ Tab
If your computer has a Mobile Intel Pentium® III processor, the Power Options Properties (Power Management Properties in Windows 98) window includes
the Intel® SpeedStep™ tab.
HINT: If you are going to connect your computer to a port replicator, click None when you program the display-close option. This setting ensures that
your computer does not enter standby mode or hibernate mode when you close (lower) the display.