Can't Boot My Usb!

[waazaa]

I have problems. I've tried unetbootin and yumi and i can't boot my USB. Both of them say that there is no error and when i try to boot the PC says: No operating system and continues with booting the HDD. I had KATANA working on the same USB. I was working with unetbootin before and with yumi. Everything was fine. But was... And i've tried both NTFS and FAT32 and on one of them yumi says that it won't be bootable.

[digip]

Check to make sure the BIOS has booting off other media enabled.

[Infiltrator]

Don't forget to make the USB bootable by making its partition active.

You can use the DISKPART utility in Windows to achieve that.

Then copy back the files to the USB and try booting it off again.

Also make sure the USB in boot options in the BIOS, is enabled or it will fail

[waazaa]

Thanks but i made it my self. On that same usb i had chrome os from those hexxeh builds. and i formated the drive with partition wizard and nothing. when i formated the USB with my ubuntu 10.10 live cd everything worked normally!