No signal via HDMI to monitor but no problem with TV ??

Feb 28, 2015
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I'm here because I'm baffled and need help. I have a late 2012 Mac Mini running Yosemite. Until today I've had the machine connected to an HDTV via HDMI. However, today I swapped out the TV in favor of a Dell U2711 monitor. Using the same cable that functioned flawlessly with the TV, the monitor reports no signal.

I've since tried two other monitors (one Samsung and another Dell) and a second HDMI cable without success. The monitors report either no signal or no cable connected.

Googling has not uncovered a solution so I'm stuck.

Any suggestions for rectifying this situation and getting the Mini to output video to an HDMI-connected monitor would be greatly appreciated.



Jun 12, 2011
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Melbourne, Australia and Ubud, Bali, Indonesia
Your Mac's Specs
2021 M1 MacBook Pro 14" macOS 13, iPhone SE 2, iPad 6, Apple Watch SE.
Hi tetrod and welcome to Mac Forums, the simple answer here is a TV is not a Monitor. A TV has a lot of complex circuitry to handle signals from all sorts of HDMI connected devices. eg Apple TV, DVD players, HiFi sound systems ect. but a monitor does not. It is simply a display device, an extension of your computer screen display.
To set up a monitor you need to use Display preferences in System Preferences.
Having said all that I have read that there have been problems connecting Mac Mini to monitors via HDMI to HDMI. It seems that the thunderbolt port works better. I know this should not be so but it might be worth a try.
In thoery it should work the same as a MacBook Pro but that uses the VGA outlet to HDMI as in this uTube clip Hooking Up a Mac Mini to a Non-Apple Screen | Tech Channel - RadioShack.
This clip does illustrate the use of Display preferences rather well though.

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