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For Enterprise products please go to Hewlett Packard Enterprise. .... Perform a hard reset of your notebook computer before you try any other troubleshooting steps. ... Ifyour computer is not listed below, refer to the User Guide for your specific model for the proper .... Remove the AC adapter and boot on battery power only.
Turn the computer off all of the way by holding in the power button until it shuts off.
Turn it back on and immediately start tapping the F8 key. It should bring you to a menu that has an option for going to "Last Known Good Configuration". Choose that option and see if it boots up.
If pressing F8 doesn't bring you to the menu - you may need to run diagnostics on the computer. To get to the diagnostics, attempt to boot to the Boot Menu by pressing F11 or F12 at the boot screen and see if it gives you the option to run diagnostics.