A laptop with an external USB hard drive and an external monitor is not booting from the internal hard drive. Power has been verified and the battery is fully charged ,, but the laptop appears to be stopping after POST. Which of the following will help troubleshoot the cause of this problem?

A.
Format the external USB hard drive.

B.
Turn off the external monitor

C.
Disconnect the external devices.

D.
Remove and reseat the laptop battery