[Solved] Can't boot from my usb flash drive suddenly

[Shujinkydink]

I have had my hackintosh for a lot of time running Osx Mavericks and windows 10 dualboot. I was always using the original flash drive that I had installed osx from to boot in to which os I wanted. Today i opened my pc and instead of booting into the flash drive it just went to the bios. When I try to boot from the flashdrive nothing happens it just goes back to the bios screen.
What can I do to boot into Mavericks i can only boot into windows from the drive i have them installed on

 

[Shujinkydink]

Turns out it had sth to do with the flash drive i installed a bootloader to another usb and it booted to mavericks