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I keep trying to use an 8GB SanDisk drive to boot the OS on a PC, and no matter which version I use of 5R1, the PC's display still in the DOS screen "Missing Operating System." What does this mean? I create the UNETbootin on a MacBook Pro, maybe 2 years old. I've tried both GNOME and KDE (which shouldn't really make a difference), and neither have worked. The PC has an AMD 64 bit processor
Did you select USB as your boot device, or move it to the top of your boot order?
Have you tried on another system?
What are the contents of the root of the USb device?
Try to use Usb Universal to boot your BT5.iso...
Here is the link ang tutorial...
http://www.pendrivelinux.com/univers...easy-as-1-2-3/
Do you have the usb unit recognized (sdb1, sdb2...), are you using it during usb installation?
I was having this issue as well; checked the md5sum to ensure it matched, reformatted drive and re-did the unetbootin multiple times and always got the "missing operating system" error. I was running unetbootin on a Windows XP machine and what finally got it to work for me was running the unetbootin utility while logged in with administrative privileges. I'm guessing admin privs are required to do whatever is necessary to make the USB drive bootable and unetbootin silently ate those errors. The files always copied fine but the USB stick wasn't bootable until I did this. Hope this helps someone down the line as I didn't see this in any of the numerous other threads I searched on this.
i am also having the same problem,i cant find any solution online, i think its the motherboard or updated bootmanager problem..
what system are you trying to run it on?