MSI MAG X570 TOMAHAWK WIFI won't boot with 3090fe

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As per the title, just built the following main components are brand new with a 5600x processor will not post with a 3090fe, it'll power initially and spin all connected fans then just dead. First light on the 4 on the mb with light for a spilt second.

Seems to randomly then not want to do anything more unless I unplug the PSU and leave it for 10mins.

PSU is a Phanteks revolt 1000w
Ram is team group elite 2400mhz 4x 4GB dimms, tried every combination in each slot from 1 dimm up to all.

Also seems to be awkward booting a 3070 in the primary pcie slot and doesn't like rebooting at all, it'll again not power back on unless I unplug the PSU and leave it 10mins or so.

Oddly it's happy with 2x gigabytes 3070s both running each from a single pcie cable Inc pigtails.

3090fe is more than happy in a older intel 7500 system running from a Phanteks revolt 850w PSU with duel pcie cables into the 2 to 12pin.

I've tired 3 x 3000 series cards in this mobo and it's randomly unhappy, I also had to set in the bios the Samsung 850 Evo Data drive to be CSM rather than ufei as it's using a old windows 10 install. Also just updated the bios to the latest version via MSI centre.

Should I RMA this board, help!
 
Thanks for all the help guys, tried with a 3600 CPU and another PSU Corsair Hx1000 and again no luck with it working consistently, sometimes it'll boot fine other times it won't.

I've contacted OCUK for RMA assistance.
 
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