Dgpu in bios caused Black screen

[Hommoff]

I have an ASUS ROG Strix SCAR 17 G733PYV-LL045W and recently it started having issues with its GPU (blue screen crashes, Windows removed it from device list multiple times) so I reinstalled Windows today in hopes it would fix the issue but it still didnt see the 4090, didnt want to load drivers and so on, only working with IGpu.

After that I made a very bad decision to force it to use Dgpu in bios (advanced settings). Now I have a laptop with a black screen that is forced to use a dgpu it doesnt see. I know the system is fine cause I hear Windows sounds when it loads.

I want to return it to dynamic display (so it would default back to iGPU) in bios but I cant because the screen is black. F9 doesnt seem to fix the issue in bios and neitger helps pressing the power button for 40 secs to reset bios. What else could I try to solve that? 

[ElectroStingz · Accepted solution]

Hello,

When you tried the EC reset was it done by having the laptop off, then plug charger in, then hold the power button down for 30-40s? This should get the defaults loaded.

Also I just tried entering the BIOS to check F9 and it seems that it does not touch the display option so whatever was set appears to remain.

Another option is the battery itself within the laptop, this is also acting as the BIOS battery so if you were to remove the connector (carefully) then leave the laptop off / press the power button to discharge anything with no power and wait maybe 2 mins. Then reconnect the battery it might help. 

[Hommoff]

Hi! Thank you. Yes, I did the ES reset the way you described and also tried removing the battery method. As neither of these helped, I'm starting to think dgpu setting is not the only problem (or maybe it doesnt get reset by resetting bios idk). I'm almost 100% sure that everything but the gpu is working, so I'll probably just take the laptop to the service before I break anything else 😄

[Tharrsan]

Hit F2 after rebooting when the white logo appears for bios and go to advanced settings, there you can switch back to dynamic