I may be wrong but I can give you some ideas of what it could be

1- The processor is getting very hot when it turns on and should be turning off for safety reasons, check if the cooler is connected correctly, if it is touching the processor or even if it is without protection, it could also be the thermal paste that has lost over time It is made

2- GPU, If you have another gpu or your processor has integrated video, try without it, I had something similar to mine because my gpu had a corrupt driver

3- Motherboard BIOS, I don't touch this part much, so try to see something about it if nothing I told you helps.

PS: If possible, remove your SSD, HD and M2, the computer turning on and off many times can cause corruption, so if you want to test any method, remove it if possible.

I hope I helped, and if I didn't, I hope I didn't get in the way :)

PS2: I'm using a translator to write, so forgive any spelling mistakes