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Desktop , no video signal

I got a desktop that was custom built, wasn't turning on, i changed the power supply and the ram, that did not fix it,
so i changed the motherboard, now it does turn on , the fans are on, and the hard drive making noise, but no video output to the screen at all , not even on the POST.

i changed the graphic card, the ram, the power supply. (on the new mother board).
and still same issue,
what else is it possible ?
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Ess Kay
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ASKER

The monitor is working on my other desktop.
And untried a new pci graphic card on the two available pic slots (after the built in graphic card didn't work)
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ASKER

Of course same cable
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deshaunstyles

I assumed as much but I had to ask lol.  Sometimes the obvious things are overlooked.
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ASKER

i tried on board graphics and pci graphic card, on the current power supply and a brand new power supply.
could it be possible that the new mother board is also defected !!
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any news, DaChosen?
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ASKER

none of these worked so i gave up
thanks for the help