WONT BOOT BIOS, HELP

[Tae]

So everything on my build is fine
I'm using 2 OLD hard drives 1 has win 8 one has win 7
And my bios won't boot, pissing me off, I'm on a micro ATX MSI e-33 h181m
With Intel pentium g3258
500 watt evga
Can someone make a checklist?
EDIT: Fixed, I put an SSD with windows XP and HDD with win 8 so my MB couldn't decide
So, I unplugged the shitty SSD and installed win 10
Thanks for looking into this thread though
you can close this thread mods

[EL Surenzo dA KK Caponeiyl]

Next time this happens, you have to let the motherboard know which drive you're booting into by selecting it in First boot device option found in bios /