I wonder if you're using a PCIe 8 pin instead of the EPS 8 pin your motherboard requires, that would be a problem.
I cant turn off my turbo in the BIOS, a lot of options are just greyed out.
But you can clear CMOS settings (reset to default)! See how to do it in your motherboard Manual.
Often, there's a two ways to do it:
1)It can be done by short-circuiting the "Clear CMOS" jumpers as it's described in "jumper settings" part of your motherboard manual. If it does not help, try the second solution.
2)Or just power off your PC, turn off your PSU, unplug it from wall socket, wait about 1 minute, then eject your battery from motherboard (it's often CR2032) and wait about 20-30 minutes, test your battery voltage (or just buy new), for CR2032 it should be 2,85-3V, then (after 20-30 mins), insert your battery in motherboard, plug your PSU cord to wall socket, then turn on PSU and power on computer.