Computer won't boot (even to BIOS)

Mar 11, 2018
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Afternoon,

Wondering if anyone has any ideas on this: My Computer wont boot at all with output to a screen.

The system powers up (appears to be fine) but I'm getting no output to the screen at all so I don't see if it is booting at all. I'm also getting no windows sound output so presuming it is not getting that far and it is Just an output issue. Just to give you some background on what I have tried so far as I'm at the point I think I may have an integral Mobo Failure.

1. Tried unplugging all peripherals and booting
2. Tried a different GPU that I know works
3. Tested the PSU- All Normal outputs
4. Tried multiple monitor incase it is a cable or monitor
5. Tried both GPU's in another PCI-E x16 slot
6. Tried removing RAM in all combinations incase there is a bad stick
7. Reset CMOS
8. Changed CMOS battery


Is there anything else anyone can think of to test / try ?