USB External Drive won't allow OS to Boot

Got a new computer with Windows 10 on internal hard drive. When I boot up with my My Book 4TB drive plugged into USB, the computer hangs up on the Dell boot screen and goes no further. Boots just fine if I disconnect the external drive.

In BIOS I removed USB from the boot sequence, so that’s not the issue. I don’t know why the computer is even looking at the USB drive when booting.

Had the same exact setup on my last PC and never had an issue.

Any ideas???



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