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

[tetrode]

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.

TIA

 

[Rod]

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.