HELP NEEDED BADLY
I have just newly bought ryzen 5 2400g with asrock b450m-hdv mobo. But from the day I bought till now i'm facing a problem. While I'm using my pc after some hours of use it suddenly turns off . When it happen my monitor got no signal,keyboard and mouse lights are also gone but my cpu cooler and case fan still run frequently and doesn't restart my pc even if i press the power or restart button it nothing happen. My cpu shows it's on but actually nothing came to my monitor or no connection in my keyboard and mouse. I thought it's an heating issue but it happened while my apu temp is in 52 - 65 °c. I did stress test and while under load cpu temp reached 80+ °c but still pc was running well. I have check my psu,ram,cpu perfectly. but cant figure out the solution or where is the problem.
AMD ryzen 5 2400g(CPU)
geil evo spear 2666 bus 8gb x 2 (RAM)
antech neo eco 550w (PSU)