Installed GRUB On A USB, After Reformatting The Computer Won't Boot When Plugged In.

I'm not really a newbie, but thought that this question would fit best in here. I had the genius (not really) idea of installing GRUB2 onto my USB flash drive, then realized that it wasn't such a great idea after all. I reformatted the USB drive and after that my computer failed to boot when it was plugged in (presumably searching the drive for a bootloader that doesn't exist). It does not even get to the BIOS screen unless I unplug my USB.

Then, I tried doing
Code:
dd if=/dev/zero of=/dev/sdc bs=512 count=1

and I still have the same problem. I'm not really sure what to do at this point.

Any help would be greatly appreciated,
Thanks.


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