Do PCs with an RS232 port use that port to display POST/BOOT/startup information?

I am troubleshooting a Dell Precision 7920. It does not boot, however it is not your typical PC problem like standard no boot, no post, no video or no power.

It turns on, seems like it does POST because it does not return any POST codes, but does not show video output. In fact, it shows no disk activity, no POST codes, nothing. So I want to know if listening to the serial port with another device would show up POST info like a journalctl log but for the POST process.

I have already tried to turn on with the minimal hardware like single RAM stick and no HDD but nothing happens.

I am asking because I don’t have a USB to serial cable and where I live hardware, in general, is expensive.