Solving Front Panel Component Problems - HP 280 G4 MT Maintenance And Service Manual

The computer boots to DOS after making a bootable flash drive.
Cause
Flash drive is bootable.
Flash drive is defective.

Solving front panel component problems

If you encounter problems with devices connected to the front panel, refer to the common causes and solutions
listed in the following table.
A USB device, headphone, or microphone is not recognized by the computer.
Cause
Device is not properly connected.
The device does not have power.
The correct device driver is not installed.
The cable from the device to the computer does not work.
The device is not working.
USB ports on the computer are disabled in Computer Setup.
80 Chapter 6 Troubleshooting without diagnostics
Solution
Install the flash drive only after the operating system boots.
Try a different flash drive.
Solution
1. Turn off the computer.
2. Reconnect the device to the front of the computer and restart
the computer.
If the USB device requires AC power, be sure one end is connected
to the device and one end is connected to a live outlet.
1. Install the correct driver for the device.
2. You might need to reboot the computer.
1. If possible, replace the cable.
2. Restart the computer.
1. Replace the device.
2. Restart the computer.
Run the Computer Setup utility and ensure that the USB ports are
set to Enabled in Security > USB Security.