iMac M4 HDMI to Roku TV: Reboot needed for Propresenter

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Level 1

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iMac M4 HDMI to Roku TV: Reboot needed for Propresenter

Hi all, I have a iMac 24-inch All-in-One - M4 chip. Just bought it for our church in January. I am a very very novice apple user. The iMac is connected to a mounted Roku TV via HDMI adapter. The only program we run that did not come with the computer is Propresenter. All is working after much trial and error. My question is, we leave the system running and it is basically only used one night a week. When I log in and start propresenter the signal doesn't seem to go to the tv (propresenter is configured correctly). However if I re-boot the system you can see the feed on the tv screen as it's booting and all works well. Is there a setting or something on the iMac that I need to set or change so we don't have to reboot the system every time we use it? Thank you for your time.

iMac (M4, 2024)

Posted on Mar 18, 2026 9:33 AM

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Answer 1

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den.thed

Level 10

92,794 points

Mar 18, 2026 10:19 AM in response to sscsr1

Sounds like the iMac is loosing the connection when the Roku TV is turned off, which is not uncommon for macOS.

If you are only using the iMac one night a week..? Then your best bet is to just shut down the iMac and startup when it is needed.

If someone else is using the iMac during the week without the Roku TV..? Try disconnecting the USB-C to HDMI adapter and cable from the iMac during the week and only connect it when you need to use the Roku TV.

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Answer 2

den.thed

Level 10

92,794 points

Mar 18, 2026 10:51 AM in response to sscsr1

I would shut it down during the week.

Time Machine will catch up after a startup.

Besides there is no reason to do hourly backups when you only use it once a week.

Plus there is no reason to leave it on for automatic macOS updates.

When you are notified of an update. You can hold off until after the meeting or until next week.

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Answer 3

sscsr1 Author

Level 1

4 points

Mar 18, 2026 10:34 AM in response to den.thed

Thanks. Sounds like that could be a thing. I leave it on so it will update but mostly because I have a ssd drive connected to it to do a time machine backup once a week. We only use it once a week because it's for a support group that only meets on Monday's. Maybe I could connect the ssd another way and try disconnecting the hdmi like you say. (They both run off the same adapter).

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