Can't boot from USB

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Have you tried different USB ports?

Assuming the USB device is bootable, it may have to be connected to the PC before you turn the power on and press F12 to make the USB boot option appear.

Yes I have tried the USB's in the front and rear. The issue is the option to Boot from USB is not showing up when you hit F12 and from what i see in the Bios everything is set up correctly

Just turn on the power and try to click on f12 while you see the company ( DELL ) 's logo :)

hope that you found your solution!

And you're sure the USB device is bootable and connected before you power the PC on?

You might try a different bootable USB device and/or wipe and recreate this one.

I have tried all the above but the issue is once you hit F12 there is NO option to boot from USB like i have seen on other computers here. That is why i went into the Bios to make sure USB was turned on.

The manual (page 98) says you can boot the T5400 from a USB device.

Do you have the latest version of BIOS, A11?

I presume the USB Controller in BIOS setup is NOT set to: USB - NO boot

What OS are you trying to boot with from the USB? Windows, Linux...?

If all else fails, try putting USB first in the Boot Sequence in BIOS setup. Be sure to save the change before exiting setup, with the USB device already connected to the PC.

If booting from USB is infrequent, you'll probably want to go back into BIOS setup and put the hard drive first again after you do whatever it is you want to accomplish by booting from USB.

Improperly formatted USB devices that are not bootable will NOT show up as a boot option.

The universal installer is a good place to start.

http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/