Win 11 doesn’t let me start the computer.

I have five-year-old Dell desktop. Since windows 11 installed itself, I have been having trouble getting it to wake from hibernation. Today it won’t wake at all. The monitor power button light pulses, but the screen stays black. The CPU power light is on. I can restart the computer by unplugging it, but Windows still won’t start. No combination of keys seems to get me into the windows, safety mode or the bios. This is scary