Upgraded to High Sierra - Can't use 2 monitors anymore
Moderator: James Steele
Re: Upgraded to High Sierra - Can't use 2 monitors anymore
Nothing yet. I also sent an email to tech support. We'll see what happens.
MacPro5,1 6-Core Intel Xeon, Processor Speed: 3.46 GHz
Number of Processors: 1
Total Number of Cores: 6
L2 Cache (per Core): 256 KB
L3 Cache: 12 MB
Memory: 32 GB. Mojave. DP 9 and Apogee Duet.
Number of Processors: 1
Total Number of Cores: 6
L2 Cache (per Core): 256 KB
L3 Cache: 12 MB
Memory: 32 GB. Mojave. DP 9 and Apogee Duet.
- mikehalloran
- Posts: 16227
- Joined: Sun Jan 25, 2009 5:08 pm
- Primary DAW OS: MacOS
- Location: Sillie Con Valley
Re: Upgraded to High Sierra - Can't use 2 monitors anymore
Did you go through the support page and ask for a call? I've never had Apple take more than 15 minutes to get back to me.NealF wrote:Nothing yet. I also sent an email to tech support. We'll see what happens.
DP 11.34; 828mkII FW, micro lite, M4, MTP/AV USB Firmware 2.0.1
2023 Mac Studio M2 8TB, 192GB RAM, OS Sequoia 15.4, USB4 8TB externals, Neumann MT48, M-Audio AIR 192|14, Mackie ProFxv3, Zoom F3 & UAC 232 32bit float recorder & interface; 2012 MBPs (x2) Catalina, Mojave
IK-NI-Izotope-PSP-Garritan-Antares, LogicPro X, Finale 27.4, Dorico 5, Notion 6, Overture 5, TwistedWave, DSP-Q 5, SmartScore64 NE Pro, Toast 20 Pro
2023 Mac Studio M2 8TB, 192GB RAM, OS Sequoia 15.4, USB4 8TB externals, Neumann MT48, M-Audio AIR 192|14, Mackie ProFxv3, Zoom F3 & UAC 232 32bit float recorder & interface; 2012 MBPs (x2) Catalina, Mojave
IK-NI-Izotope-PSP-Garritan-Antares, LogicPro X, Finale 27.4, Dorico 5, Notion 6, Overture 5, TwistedWave, DSP-Q 5, SmartScore64 NE Pro, Toast 20 Pro
Re: Upgraded to High Sierra - Can't use 2 monitors anymore
I must have missed that. I asked them to email me. But I'll go back and see if I can do the call.
MacPro5,1 6-Core Intel Xeon, Processor Speed: 3.46 GHz
Number of Processors: 1
Total Number of Cores: 6
L2 Cache (per Core): 256 KB
L3 Cache: 12 MB
Memory: 32 GB. Mojave. DP 9 and Apogee Duet.
Number of Processors: 1
Total Number of Cores: 6
L2 Cache (per Core): 256 KB
L3 Cache: 12 MB
Memory: 32 GB. Mojave. DP 9 and Apogee Duet.
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Re: Upgraded to High Sierra - Can't use 2 monitors anymore
I just called 800-275-2273. Looks like the entire call took a grand total of 10 mins when I had them walk me through restoring my OS.
16-inch MBP M4 Max (2024), 15.5.x, 64GB RAM ::: 14-inch MBP M1 Max (2021), 13.6.x, 64GB RAM, UAD Quad Tb Satellite, 4 displays ::: 2009 4,1 > 5,1 MacPro 12-core 3.33 ghz , 10.14.x, 96GB RAM, GeForce GTX 770 , NewerTech eSATA/USB3 PCIe Host Adapter, UAD-2 Quad, ::: 15-inch MBP (2015) 10.14.x, 16GB RAM ::: Lynx Aurora (n) USB ::: DP (latest version), Vienna Ensemble Pro danwool.com
Re: Upgraded to High Sierra - Can't use 2 monitors anymore
I also got Apple on the phone yesterday.
Turned out really simple. Here's what they had me do as best as I can recall.
1. Restart while holding down command and R.
2. When apple log appears, let go. You get a screen with a few options.
3. Open the Disk Utility option
4. Erase the main drive. (Not sure if it was after this step or the next one, but you get a drop down box after erasing that let's you pick the HFS formatting for your drive. That's what I wanted, since I'm going back to El Capitan.)
5. Quit disk utility
6. Open "Restore from Time Machine."
7. Then you get a list of dates you can restore from.
5 hours later, Voila!
Turned out really simple. Here's what they had me do as best as I can recall.
1. Restart while holding down command and R.
2. When apple log appears, let go. You get a screen with a few options.
3. Open the Disk Utility option
4. Erase the main drive. (Not sure if it was after this step or the next one, but you get a drop down box after erasing that let's you pick the HFS formatting for your drive. That's what I wanted, since I'm going back to El Capitan.)
5. Quit disk utility
6. Open "Restore from Time Machine."
7. Then you get a list of dates you can restore from.
5 hours later, Voila!
MacPro5,1 6-Core Intel Xeon, Processor Speed: 3.46 GHz
Number of Processors: 1
Total Number of Cores: 6
L2 Cache (per Core): 256 KB
L3 Cache: 12 MB
Memory: 32 GB. Mojave. DP 9 and Apogee Duet.
Number of Processors: 1
Total Number of Cores: 6
L2 Cache (per Core): 256 KB
L3 Cache: 12 MB
Memory: 32 GB. Mojave. DP 9 and Apogee Duet.
- mikehalloran
- Posts: 16227
- Joined: Sun Jan 25, 2009 5:08 pm
- Primary DAW OS: MacOS
- Location: Sillie Con Valley
Re: Upgraded to High Sierra - Can't use 2 monitors anymore
Good.
That was the first way I suggested. Everything else was only if that didn’t work. Because of APFS, I didn’t know it would.
That was the first way I suggested. Everything else was only if that didn’t work. Because of APFS, I didn’t know it would.
A straight restore may work — I’ve never tried it over APFS. Command r into the Repair partition and follow the normal procedures. If you get the error that you can’t restore to an older OS...
DP 11.34; 828mkII FW, micro lite, M4, MTP/AV USB Firmware 2.0.1
2023 Mac Studio M2 8TB, 192GB RAM, OS Sequoia 15.4, USB4 8TB externals, Neumann MT48, M-Audio AIR 192|14, Mackie ProFxv3, Zoom F3 & UAC 232 32bit float recorder & interface; 2012 MBPs (x2) Catalina, Mojave
IK-NI-Izotope-PSP-Garritan-Antares, LogicPro X, Finale 27.4, Dorico 5, Notion 6, Overture 5, TwistedWave, DSP-Q 5, SmartScore64 NE Pro, Toast 20 Pro
2023 Mac Studio M2 8TB, 192GB RAM, OS Sequoia 15.4, USB4 8TB externals, Neumann MT48, M-Audio AIR 192|14, Mackie ProFxv3, Zoom F3 & UAC 232 32bit float recorder & interface; 2012 MBPs (x2) Catalina, Mojave
IK-NI-Izotope-PSP-Garritan-Antares, LogicPro X, Finale 27.4, Dorico 5, Notion 6, Overture 5, TwistedWave, DSP-Q 5, SmartScore64 NE Pro, Toast 20 Pro
Re: Upgraded to High Sierra - Can't use 2 monitors anymore
In the beginning of this thread I was in a fog. 
Thanks for all the help.

Thanks for all the help.
MacPro5,1 6-Core Intel Xeon, Processor Speed: 3.46 GHz
Number of Processors: 1
Total Number of Cores: 6
L2 Cache (per Core): 256 KB
L3 Cache: 12 MB
Memory: 32 GB. Mojave. DP 9 and Apogee Duet.
Number of Processors: 1
Total Number of Cores: 6
L2 Cache (per Core): 256 KB
L3 Cache: 12 MB
Memory: 32 GB. Mojave. DP 9 and Apogee Duet.
- mikehalloran
- Posts: 16227
- Joined: Sun Jan 25, 2009 5:08 pm
- Primary DAW OS: MacOS
- Location: Sillie Con Valley
Re: Upgraded to High Sierra - Can't use 2 monitors anymore
Sure. I learned a few things, too.NealF wrote:In the beginning of this thread I was in a fog.
Thanks for all the help.

DP 11.34; 828mkII FW, micro lite, M4, MTP/AV USB Firmware 2.0.1
2023 Mac Studio M2 8TB, 192GB RAM, OS Sequoia 15.4, USB4 8TB externals, Neumann MT48, M-Audio AIR 192|14, Mackie ProFxv3, Zoom F3 & UAC 232 32bit float recorder & interface; 2012 MBPs (x2) Catalina, Mojave
IK-NI-Izotope-PSP-Garritan-Antares, LogicPro X, Finale 27.4, Dorico 5, Notion 6, Overture 5, TwistedWave, DSP-Q 5, SmartScore64 NE Pro, Toast 20 Pro
2023 Mac Studio M2 8TB, 192GB RAM, OS Sequoia 15.4, USB4 8TB externals, Neumann MT48, M-Audio AIR 192|14, Mackie ProFxv3, Zoom F3 & UAC 232 32bit float recorder & interface; 2012 MBPs (x2) Catalina, Mojave
IK-NI-Izotope-PSP-Garritan-Antares, LogicPro X, Finale 27.4, Dorico 5, Notion 6, Overture 5, TwistedWave, DSP-Q 5, SmartScore64 NE Pro, Toast 20 Pro