HP Compaq Pro 4300 Maintenance And Service Manual page 150

Table C-15
USB flash drive is not seen as a drive letter in Windows.
Cause
The drive letter after the last physical drive is not available.
USB flash drive not found (identified).
Cause
The device is attached to a USB port that has been hidden in
Computer Setup.
The device was not properly seated before power-up.
System will not boot from USB flash drive.
Cause
Boot order is not correct.
Removable Media Boot is disabled in the Computer Setup
utility.
The computer boots to DOS after making a bootable flash drive.
Cause
Flash drive is bootable.
Flash drive is defective.
142 Appendix C Troubleshooting Without Diagnostics
Solving USB Flash Drive Problems
Solution
Change the default drive letter for the flash drive in Windows.
Solution
Run the Computer Setup utility and enable USB ports in
Security > USB Security.
Ensure the device is fully inserted into the USB port before
applying power to the system
Solution
Run the Computer Setup utility and change boot sequence in
Storage > Boot Order.
Run the Computer Setup utility and enable booting to
removable media in Storage > Storage Options. Ensure
USB is enabled in Storage > Boot Order.
Solution
Install the flash drive only after the operating system boots.
Try a different flash drive.