Question 9C & A2 Codes preventing boot to Windows

Feb 13, 2023
Motherboard : MSI H97 Gaming 3
CPU : Intel i5-4590
GPU : Gigabyte GT 1030
SSD : Kingston 250GB
PSU : Turbo-x 650W

Hello guys.
I am getting the below codes, when starting up my computer and trying to boot into Windows 10,
which result to a black screen.
Codes : 9C followed by A2.
Apparently 9C is referred to "USB init." Usually caused by bad USB device connected or bad cable/port inside case or motherboard
and A2 is related to the bootable devices on your computer.

At first, I though that the issue might be with my drive,
so here are the things that I tried:
-Disconnected/reconnected the drive.
-Reinstalled windows 10 + cleaned and repartitioned the disk via CMD.
-Tried a different drive.

Issue persisted, so I then started troubleshooting the USBs and found out that the issue
occurs , only when I have a USB device(or many devices) , connected to the computer.
Whenever I disconnect my USB devices, the Codes are gone and the boot is flawless.

Here's a couple of things I've tried , regarding the USBs:
-Updated BIOS/Chipset/Drivers.
-Disabled all devices, except of my Boot directory, on BIOS.
-Tried different USB devices on every single one of the ports.
-Tried a different PSU + RAM.
-At the end, I tried installing a legacy/old BIOS update, in order to see if that's gonna fix it,
however the issue persisted again.

Do you have any suggestions?

Thanks for your time,


At the next sucessful boot try running the built in Windows troubleshooters. The troubleshooters may find and fix something.

Failing that, try "sfc /scannow" and "dism".


How to use DISM command tool to repair Windows 10 image | Windows Central

If the problem continues then power down, unplug, open the case.

Verify that all connectors, cards, RAM, jumpers, and case connections are fully and firmly in place.

Use a bright flashligh to carefully inspect for signs of damage. Especially around the USB ports and I/O panel.

Could be that the presence of one or more physically connected USB devices is causing an electrical short.