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here's the problem: I made a bootable USB stick to boot Linux mint using Unetbootin.

When I tried to boot off it, though, the following message came:

BOOTMGR is missing.
press CTRL-ALT-DELETE to reboot.

after I pressed CTRL-ALT-DELETE, it booted to windows. I tried booting the USB on my friend's laptop (which is the exact same as mine, Samsung E300) and it worked fine.

can the problem be cause of this?:

Yesterday, I got this message

Error: no such partition.
Grub rescue>_

and used this to resolve it:

starting from picture 3. can this be the problem? how can I resolve this?

thanks in advance.

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Does your system use BIOS or UEFI? – Ramhound Sep 8 '13 at 16:55
BIOS, it user Bios to boot. – techgenius101 Sep 8 '13 at 16:57
Looks like your USB media isn't actually bootable. – Ramhound Sep 8 '13 at 17:05
but, as it said, it booted from my USB on my friend's laptop fine – techgenius101 Sep 10 '13 at 15:40
Did you modify the boot order on your laptop? – Ramhound Sep 10 '13 at 16:46

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