PowerEdge R720xd server just died this morning with following error:

• Normal Thu Sep 10 2020 04:35:26 An OS graceful shut-down occurred.
• Normal Thu Sep 10 2020 04:35:26 OEM software event.
  Critical Thu Sep  10 2020 04:37:17 A bus fatal error was detected on a component at bus 8 device 0 function 0.
• Critical Thu Sep 10 2020 04:37:21 A bus fatal error was detected on a component at bus 0 device 28 function 7.
• Normal Thu Sep 10 2020 04:37:21 An OEM diagnostic event occurred.

Now, the server won't even boot up. When powered on, there is no display on the console. It just stays dark. The HDD lights blink for a moment on startup then go out. We haven't added/modified any hardware on the server. The firmware were updated about a year ago.