turn off usb boot device on ML350 G5?

[T.R.189264655]

how can I turn off the usb boot device on the ml350 G5, operating system win server standard 2008. I have an external Drive and usb dongle attached and everytime I have to reboot the server it doesn't boot from harddisk. I changed the boot sequence and put the usb boot device behind the Rom, harddisk, and floppy but still the usb device boots first.
Can I turn off the usb boot device?
Is there any other possibility or solution?

[Gary Benavides Meza]

- Press F9 Key when prompted for Rom-Based Setup Utility.
- Go to System Options
- Select USB Control
- Select Legacy USB and disable it

When Legacy USB Disabled is selected, all USB ports are enabled under a USB-aware Operating System, but USB is not supported during POST, but Legacy USB disabled also disables iLO 2 virtual devices

Refer to HP RBSU User Guide Page 14:
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00191707/c00191707.pdf