Computer problem?

Hello there, I am here seeking your help.

I have 2 desktops, both seem to have the same problem despite them being different models/brands.

Problem:
No screen image, despite fans spinning and what it seems a working HDD. NOTICE: When i removed the RAM there were no "BEEPS" from the motherboard indicating they were out.

Things I have tried so far that haven't worked:
-Replace video card
-Replace RAM
-Unplug everything except necessary components for the Computer to start (RAM, PSU)
-Air blow it thoroughly.


I am running out of ideas, also the HDD's work fine I tried them on other computers.

I am running out of ideas any suggestions would be appreciated.

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