My PC has a Ryzen 3 3200G with integrated Radeon Vega 8 graphics, an ASUS Prime A520M-K motherboard, 16 GB of DDR4 RAM in two 8 GB sticks, no dedicated graphics card, and Windows 11 23H2. While playing Roblox ER:LC, the system froze and showed a SYSTEM_THREAD_EXCEPTION_NOT_HANDLED blue screen naming amdkmdag.sys. After restarting, it worked normally for about two hours, but after sitting powered off for several hours it froze again while I was playing Napoleon: Total War. This time the sound stopped, the keyboard lights went out, and the mouse had power but did not respond. Since then, the fans and case lights turn on, but the monitor shows no signal and the keyboard does not light up. I have checked the display and USB connections, tried multiple working keyboards and mice, cleared the CMOS, and tested both RAM sticks individually. The Ryzen 3 3200G is supported by the current BIOS, but the system still does not appear to reach POST, so I cannot enter BIOS or boot Windows to reinstall the AMD drivers. Could the original amdkmdag.sys crash be connected to the current no-display and no-keyboard symptoms, and what hardware should I test next?
3 Answers
Since the system is not reaching POST, reinstalling the AMD driver is not possible yet and would not explain the missing BIOS display. Disconnect everything unnecessary, including storage drives and USB devices, and leave only the motherboard, CPU, cooler, one RAM stick, and monitor connected. Check the 24-pin motherboard connector and the 8-pin CPU power connector carefully. If there is still no POST after the CMOS reset and RAM tests, the likely suspects become the power supply, motherboard, or the 3200G's integrated graphics.
amdkmdag.sys belongs to the AMD graphics driver, so the first crash could have been caused by either a corrupted driver or a problem with the integrated GPU. However, the current symptoms happen before Windows loads: no display, no keyboard initialization, and no way to enter BIOS. That points more toward a hardware, firmware, power, or memory issue than a normal driver problem. Clearing CMOS and trying one RAM stick at a time were the right first steps. Make sure the single stick is in the slot recommended by the motherboard manual, then test the other stick in that same slot. If possible, the most useful next test would be another compatible power supply or a basic dedicated graphics card.
The earlier crash may have exposed a failing integrated GPU, but it is not proof by itself because amdkmdag.sys can also crash from unstable RAM, BIOS settings, or a bad AMD driver. At this point, concentrate on determining whether the machine can POST. Look for any speaker beep codes if a motherboard speaker is installed, and verify that the monitor is connected to the motherboard's video output. If you can borrow a known-good compatible PSU or graphics card, test those before buying parts. If another GPU produces a picture, the integrated graphics or processor may be at fault; if there is still no POST, the motherboard or PSU becomes more likely.
I already reset the BIOS and tested each RAM stick separately, but the system still gives no display or keyboard lights. I also do not have a dedicated graphics card available, so I cannot bypass the integrated graphics for testing.