Press and hold down the power button until the computer shuts off. Then wait at least ten seconds and power it back on.
While it is booting up and you see the Dell logo on the screen, press and hold the F8 button. When the next screen appears, you will see a list of options for how you would like to continue the boot up process. Highlight the option titled "last known good configuration" and press enter. Your computer will restart and load up with all of the settings previously used before it began giving you problems.
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