vega 64 total black screen after turbo mode

After updating to the most recent Crimson driver I tried switching my GPUs to turbo mode. The screnn suddenly had a yellow tint and a black screen occured. Since then I got a total blackscreen  (I cant even see the UEFI ) and there is no HDMI signal even though the system is running.

I tried clearing the cmos, removed Ram, part testing etc..

Part list:

• AMD Graphics Card
  • 2x Gigabyte Rx Vega 64 FE
    
• Desktop
• Operating System
  • Windows 10 64bit
• Driver version installed
  • Latest Radeon Software Crimson Edition offered yesterday (cant check due to blackscreen duh!)
    
• Display Devices
  • Asus 24" Monitor via HDMI
• Motherboard
  
  • MSI Gaming Pro Carbon x370
    
• CPU/APU
  • Ryzen 7 1700x
    
• Power Supply Unit
  • Be quiet Dark Power Pro 11 1000w
    
• RAM
  • Corsair 1 x 16GB

How can I remove these turbo settings manually with no video output and hopefully resolve this problem as no parts seem to be faulty except those Crimson drivers lastly set to turbo mode?