Pc won't boot with sas card in x16 slot

[Sulprax]

Hello, 

I'm currently building my new unraid server to take advantage of the built in graphics for transcoding. 

 

I use vms for pfsense, adguard, home assistant and blue iris. 

 

Motherboard: nzxt N5 Z690

Cpu: I9 12900

Ram: 128gb ddr4

PCI: 2x 560SFP+ Dual Port 10GB 1 for pfsense the other for unraid to a 10gb sfp+ switch

2x 1tb nvme

 

Everything is working perfectly untill I need to add more storage 

 

I would like to add the DELL PERC H200 Lsi to the x16 slot

 

But pc won't boot when it's in the gpu x16 slot the gpu error led stays on and no bios or boot

 

If I take all the pci cards out still the same error led. 

 

If I put the lsi in the slot below and remove one sfp+ cards all boots up perfectly. 

 

If I put one of the sfp+ cards in the gpu pci slot the dram error led stays lit and won't boot either. 

 

If I put a gpu in that slot all boots up fine. 

 

I have no idea why this is happening or how to fix it. 

 

Any help would be appreciated

 

Regards