Grub loader: Error 21 (unable to log in to ubuntu)

Asked by shri81

 Tried to make my USB a bootable device not sure if I was successfull. Got a prompt to restart the computer not unable to log in.

The first message that I get when I try to log in is Grub loader Error 21.
and then no activity at all.

I use Ubuntu on my comp and do not have dual boot option.

I have no clue how to get access to my computer or how to remove this error message.

Please help me log in.

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Ubuntu grub Edit question
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nhasian (nhasian) said :

I had the same problem with my HP dv9500 laptop. i was able to resolve the issue by going into the bios and telling the computer to boot from USB-HD instead of USB-floppy i had two or three different usb boot options. you may have something similar.

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marcobra (Marco Braida) (marcobra) said :
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shri81 (shri81) said :

Nhasian thank you for your response I tried that too but did not work.
Marcobra: I did go through the instances, honestly I did not have the patience. I just did a complete re installation on my comp.