R720 PCIe training error: system halted

Hello,

I have an R720 dell server. As I am booting the server, after initializing the iDRAC it is giving me an error PCIe training error: system halted and it is not letting me do anything after this, not even go to the BIOS. I have tried removing the PCIe card including the RAID controller as well. But nothing is working. Could anyone please suggest me anything on this?

Thanks and regards,