Question PC turns on and off continuously ?

Oct 22, 2021
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Mother Board: Gigabyte GA-H270M-DS3H
RAM: 4gb JM DDR4 2666 U-DIMM 1Rx8 1.2V
PSU: 750 (I think)

After i install Windows 10 Pro , then pc got blue screen saying "whea uncorrectable error" and i pull out the plug cuz there no sayin it restart or button to restart.
After that i turn on the PC and pc turn on and turn off. I remove the ram but still pc turn off and on continuously, i dont know what to do.
i remove the hdd but still pc turn on and off, no display cuz pc turn on like for 3sec only, then turn off. Please help me & thank you in advance.