trs96
Moderator
- Joined
- Jul 30, 2012
- Messages
- 25,511
- Motherboard
- Gigabyte B460M Aorus Pro
- CPU
- i5-10500
- Graphics
- RX 570
- Mac
- Mobile Phone
First, I can report that I don't think the CMOS battery is at fault for me. I did swap it with a fresh battery, but I had the same result with unchecking the Enable Legacy Option ROMs setting - no display at all during boot up. The system doesn't hang while in this state, there just is no display until the OS initializes graphics, which is at the login screen for both macOS and Fedora.
With my 7010 USFF I tested the original battery with a multi-meter and it measured just slightly below 3V. Testing with a meter doesn't place any load on the battery. So to test further, I placed it in a Windows 7 legacy PC connected via VGA to see if it would hold the BIOS info. Doing this eliminates any macOS installed on a PC issues as a cause of booting problems.
After changing some bios settings on the PC, shutting down and unplugging it for a while, I tried to boot again. All the BIOS changes were lost and returned to default. That verified that the battery couldn't hold a charge anymore.
I put a brand new CR2032 in my 7010 and haven't had any problems since then, about 2 weeks ago. I think your graphics problems are probably related to something else other than the CMOS battery. If your BIOS is not going back to default settings, we know that for certain.
We'll have to keep researching this to find the cause. I haven't completely ruled out the last two Dell BIOS updates (the 2 2018 versions) as a problem but I'm looking into that.
Post a screenshot of what the Boot Sequence page of your BIOS looks like.For reference, with my testing last night, I made it about 3 or 4 system restarts before I encountered any issues, the changes I remember i had made after the last good boot was changing the wallpaper, signing in to the App Store, and then installing the iTunes and Safari updates.
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