If I use the AMD Ryzen Master program or bios to adjust the GPU core clock to any setting besides the default it works fine except when I reboot the computer then the computer shuts off. Trying to start the computer it will not start. I have to clear the bios on the motherboard and then the computer will start and I have to setup the bios every time. If I overclock the CPU and/or memory from the bios or Ryzen master program then the computer works as expected. Overclock works and I can reboot the computer. It's only if I change the GPU core clock in bios or Ryzen master that the computer shuts off on every reboot. Besides the issue with the GPU the system runs nice, quiet and cool.
Processor: --- Ryzen 5 2400G with Radeon RX Vega 11 Graphics
Motherboard: Gigabyte AB350M-DS3H ver 1.x
Bios: ----------- F23d
Memory: ----- Corsair VengeanceRGB - CMR16GX4M2C3000C15 - 2x8gb - 3000MHz
Hard Drive: -- Samsung SSD 860 EVO 500GB
Cooler: ------ Corsair H100i v2 Liquid Cooler
ecsservicesus, sorry but it looks obvious that your system does not like to have the IGU OCed. Please tell us what wattage power supply you are using. Make sure you have the CPU 8 and/or 4 pin power connectors plugged securely. Make sure you have the latest AMD chip set and graphics drivers DLed from the AMD driver DL site using the manual method and are using the Ryzen Balanced power plan. Enjoy, John.