Does not recognize bootable usb

My HP laptop does not recognize some bootable usb devices in the boot menu.
I have a HP tower and the laptop in my office and the tower will recognize and boot the a USB device that the laptop will not recognize in the boot menu.
Laptop: HP Pavilion dm1z-4100, BIOS HP vF.19 2/4/2013, Windows 7 Pro 64bit
Tower: HP HPE-480t, BIOS American Megatrends v6.10 9/16/2010, Windows 7 Pro 64bit
Example of non recognized device in laptop (OK in tower): USB HDD WD60 OUE-22 HCTO
The external HDD reacts the same as some memory sticks. All the boot devices appear to be syslinux bootable
I have never found a non recognized bootable device in the tower PC boot menu, but several in the laptop PC.
No problem with laptop using external CD/DVD drive
The problem appears to be in the BIOS, because the boot menu occurs prior to the operating system.
Latest BIOS listed in the updates is F.19 (same as installed)
Any comments?

Hi lrclost,
Thank you for visiting the HP Support Forums and Welcome. I have read your thread on your HP Pavilion dm1z-4100 Notebook and not recognize some bootable usb devices in the boot menu. Here is a link to secure boot.
This document will explain the differences in boots.
Hope this is helpful.
Thanks.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

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Message was edited by: iddrew

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Does not recognize bootable usb

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