PC Tus On, Monitor Goes Black, Fans Still Run After

I've been having this problem in which my PC is tued on and it runs fine for a couple of hours, or even days. But, randomly in a day while I'm using it, my monitor just goes black, saying Display Not Found on the screen. On the other hand, my fans keep running.

Sometimes, I even wait a couple of days not using this pc, just to test it again later. And, all of that repeats, I'm able to use the pc for a couple of hours or days, and then the display goes off with the fans still running. Some stuff I've already tried:

1 - I tested the monitor on other pcs, it works fine in all of them.

2 - I tried running using just the necessary: RAM, Harddrive, Processor, I even lowered the number of fans I have, no success.

This problem of no display happens when I try to use on-board graphics, or if I try to use other PCI graphics cards I have, both cases lead me to this black screen. Does anyone there can give me a hint? Because, I'm starting to consider that this might be a motherboard problem.

Thank you,

Lucas Meyer.

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