ROG Strix E-570 quick degraded to no indication of ANY BIOS start (no beep)

I have an E-570 setup running an AMD Ryzen 7 chip with a Linux Mint OS, and a GEFORCE RTX-3070-Ti GPU. I recently purchased an Thermalake ATX case, to replace an older ATX case, and proceeded to slowly and methodically transplant my hardware to the new tower. When I was done, I did a test startup and everything seem to be ok; all drives were detected, the display and other hardware setting were fine. The only issue initially was that the Ethernet was not working despite system saying a connection was found. I then restarted the system to see if that would help, but then the system booted into a low resolution (1024x728) mode and the system said that a display was not found. After a couple of reboots, I got nothing: no BIOS beep, nothing on the screen, no indication of activity. The motherboard had a q-code of AA, for winch I could not find a clear definition. When I pulled the 3070 and tried to run display off of the motherboard, I got a 9E q-code on the board and still no activity. I checked all the connections and I cannot find a loose or missing one.

Any diagnostic or instructional suggestions are welcome!

 

Sounds like something got slightly unseated during the case swap and now it’s stuck before POST. The “AA” code usually means it was in a normal boot state, and “9E” is often PCIe/boot device related, so I’d go straight to a bare-minimum boot test.

Here’s what to do:

1. Full power drain + clear CMOS
   Shut down, flip PSU switch off, unplug it, hold the power button 15 sec.
   Then clear CMOS (button/jumper or pull battery for 5 mins).
   
   
2. Reseat the basics
   *24-pin ATX *8-pin CPU power (top left) *RAM (try 1 stick only in the recommended slot) *CPU cooler pressure (don’t overtighten)
3. Boot with minimum parts
4. Motherboard + CPU + cooler + 1 RAM stick + GPU only.
   Disconnect all drives and USB devices.
   
   
5. GPU sanity check
   Reseat the 3070 Ti and make sure ALL PCIe power plugs are fully clicked in.
   Try a different PCIe slot if possible.
   
   
6. If your Ryzen has no iGPU
   The motherboard HDMI/DP won’t output anything without an APU, so don’t rely on that test.

If it still won’t POST after that, the next suspects are a bad riser/stand-off shorting the board, or a damaged PCIe slot/GPU. Easiest confirmation is testing the GPU in another PC or trying a spare GPU in this board.