Error encountered during startup or compatibility mismatch. Model: X870E AORUS ELITE WIFI7, Version 1.1.
Error encountered during startup or compatibility mismatch. Model: X870E AORUS ELITE WIFI7, Version 1.1.
Hello there! This is my debut here, and I’m hoping someone can assist with this odd issue. I stumbled upon a pretty suspicious but still annoying error while trying to start my new PC (details below). The main challenge is that after POST, my monitor sometimes doesn’t show anything on it, even though it’s powered on. I have to switch it back to HDMI input—even though it was always set to HDMI—and then it smoothly launches Windows. This step isn’t reliable; I often land on error codes like A6 or 99 while the 'Boot' light is on, and I’m forced to keep restarting until I finally get in.
When I try to enter BIOS, the problem is clear. Once I power on the PC, the monitor still shows no HDMI input. Pressing the BIOS key (Del) repeatedly without any output leaves me stuck on one of those codes. I’ve tried resetting the GPU, checking the PSU, and even swapped out the SSD. There’s a note about reseating the CMOS battery, but I’m not sure if that worked after touching the pins with a screwdriver.
I’m using an X870E AORUS ELITE WIFI7 with BIOS version F7. The PC came into service, and surprisingly, they booted it into BIOS instantly. Should I worry more about my monitor, the HDMI cable, or the power supply? A technician suggested a possible driver or chipset mismatch, but I doubt it. After returning home, I was still stuck—my screen went black at startup.
I figured I might have an APU, so I moved the HDMI port from the GPU to the motherboard’s I/O. That helped a bit, though I wasn’t sure if shorting the CLR-CMOS pins fixed it after using a screwdriver. While in Windows, I restarted, kept the cable in place, and managed to enter BIOS successfully. I made some changes, saved them, and exited.
Back in Windows, I swapped the HDMI back to the GPU, and everything worked perfectly—except for the fact that my monitor still wouldn’t boot into BIOS. It was a black screen at startup. Then I considered it an APU setup, but the cable and power outlet seemed fine. My peripherals (keyboard and mouse) were unresponsive at first, only reacting once I was in Windows. So I restarted again, kept the cable on, and eventually got into BIOS.
Some advice others gave: check for GPU/Motherboard driver issues, look into PSU health, and inspect the HDMI connection. The tech mentioned debug codes like 99 (Super IO init), 00 (CPU), and A6 (storage/BIOS). They suggested a possible chipset or driver incompatibility. Others pointed out the PSU and even my monitor as potential culprits. My VG1B gaming monitor, which worked perfectly before, is now the focus.
My current thoughts: it might be my monitor, the HDMI cable, or the power outlet that’s causing the problem. I’m not sure what to prioritize right now. Any insights or solutions would be greatly appreciated!
Upgrade your BIOS to the latest F8a version or newer, even if labeled as beta. Gigabyte frequently resolves POST issues and display glitches in those releases. Try using another DisplayPort cable and check the monitor if you can. HDMI handshakes may behave unpredictably during startup. Consider booting with just the GPU and one RAM stick to eliminate memory-related problems. Turn off fast boot in BIOS and see if Windows provides extra time for device setup. Make sure your GPU is properly seated and all PCIe power cables are tight. Since the store accessed BIOS quickly, the problem likely lies with a monitor, HDMI connection, or a BIOS-specific quirk. My initial approach would be to update the BIOS and test a different cable/port.
Avoid watching the screen when starting up; focus on the drive activity indicator. As soon as it lights up, press the key to access BIOS successfully. This method works consistently for me.
The situation isn't what it seems. I hoped the issue was just my slow performance, but it’s not that simple—I could keep pressing the BIOS key without success. Updating to F8a didn’t resolve the problem either. I wasn’t sure if this version would help or make things worse. According to GIGABYTE, the BIOS F7 has a checksum update (21B2) and several patches addressing security fixes, including TPM2.0 vulnerabilities and AMD microcode issues. The F8a release adds support for newer CPUs and improves stability. From my side, I’m still unsure what these changes actually do, especially with my current setup. My GPU boots slowly, and the monitor only accepts HDMI 2.0, even though my RTX 5080 should work with HDMI 2.1. The single HDMI port on the GPU seems to be the main concern.
Switching from F7 to F8a could actually improve things, as F8a introduces updated AGESA and stability enhancements. If you're still facing problems on F7, testing F8a is a good idea. In the unlikely event it doesn't resolve the issue, you can always revert back. Also, your HDMI 2.0 display should function properly with the 5080, though performance will be limited to HDMI 2.0 bandwidth—just avoid pushing extremely high refresh rates for 4K.
I updated the BIOS to version F8a, yet the issue remains unresolved. Since my PC functioned properly at the tech shop, it's unclear what might be causing the problem now. Could the HDMI cable, monitor, or other peripherals be faulty? It seems the wall outlet setup after assembling the PC triggered a safety feature—switching off the outlets automatically. After disconnecting everything and testing different outlets, the PC started working but displayed nothing. Any suggestions?