Aurora R12, no output, even bios

Question

Changed from CSM to UEFI, but when trying to boot, it won't post. When powering on, flickers and ends on just a black screen. The board is an Aurora r12. Of which has no video ports of it's own.
Currently only plugged in with an HDMI cable. (Though there's another cable in the mail)
I've tried:
Removing the cmos battery and unplugging power from the PC for 20 minutes
Bridging the cmos_clr pins.
Holding down power for about 30 seconds to try and clear flea power.
Unplugging all hard drives.
Reseating the GPU.
Reseating the RAM.

I haven't messed with any voltage or anything, so I can't imagine hardware died or anything, but I'm really having trouble with this.

anne_droid · Answer

Hi Changed what item? The BIOS setting/option? The formatting of the hard drive? BOTH?

Vanadiel · Answer

Does it have an OEM Dell video card in it, or aftermarket card?

user_adf029 · Answer

@anne_droid​ In BIOs I swapped from CSM/Legacy to UEFI. I don't expect the MBR windows to work so much with a UEFI bios setting.

user_adf029 · Answer

@Vanadiel​ I'm like... 90% sure it's after-market. It's a second hand PC. I don't think the Alienware r12 ever came with a 1070-TI.

Vanadiel · Answer

That is your issue. As soon as you swap to UEFI without compatibility mode, you will not get video output unless you use a Dell OEM video card that came with the R12.

The UEFI has no support for aftermarket video BIOS...

user_adf029 · Answer

@Vanadiel​ But trying to reset bios also doesn't give output. Is there anything I can do? In theory I could try and blind do the settings. But that's not the most ideal. If I could update the aftermarket GPU with UEFI firmware, that would be easier

Vanadiel · Answer

We have seen this before. Once you switch to UEFI and turn of CSM, the video BIOS needs to be UEFI compatible and in this case only OEM video BIOS is compatible.

That includes the BIOS setup.

If you put in the original OEM video card you should get video back.

user_adf029 · Answer

@Vanadiel​ What do I do in the case where the system is second hand and I don't know for sure which the original OEM card is? Would any UEFI compatable card work? Or is there a CSM set bios I can try and emergency flash with ctrl+escape?Or is there a way I can navigate this blind?

user_adf029 · Answer

@Vanadiel​ I found the OEM card it came with. It's a 1660-ti. But it still leaves me with the same black screen issue...

Vanadiel · Answer

A thing to try is replace the CMOS battery.

bradthetechnut · Answer

Switch back to CSM/Legacy.  If you have Windows, it'll only boot in the same mode it was loaded in.  May need to reload Windows with BIOS in UEFI mode.

Alienware Desktops

Aurora R12, no output, even bios

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