Question My monitor screen has a red tint all over, but only when the HDMI cable is connected.

[Braznor]

The power went off due to a nearby lightning strike and since then, the monitor screen has a red tint all over except when the HDMI cable isn't connected.

When the HDMI cable isn't connected, the screen color looks normal.

I checked the PC with another monitor and that one is displaying fine. On the monitor with the problem I changed the HDMI cable and it has no effect. As soon as the monitor is connected to my PC, the screen resumes it red tint even when booting up.
What could be the problem?

 

[Furious_Styles]

It must've been damaged by that lightning strike. You've pretty much ruled out the cable and the GPU so that only leaves one thing left sadly. You probably already checked the monitor power cable but if not you might as well. Different power strip outlet too.

 

[Braznor]

It must've been damaged by that lightning strike. You've pretty much ruled out the cable and the GPU so that only leaves one thing left sadly. You probably already checked the monitor power cable but if not you might as well. Different power strip outlet too.

But the red tint isn't there when the HDMI cable is not connected.

 

[Furious_Styles]

But the red tint isn't there when the HDMI cable is not connected.

Have you tried a different HDMI port? Sometimes in repairing boards I've had a pin get dirty on the hdmi port and it caused a problem similar to that.

 

[Hail The Brain Slug]

Have you tried a different HDMI port? Sometimes in repairing boards I've had a pin get dirty on the hdmi port and it caused a problem similar to that.

A tint like that on a video input definitely sounds like a pin issue. Either a pin was scorched and no longer makes good contact with the cable or something internal on the PCB where the port is soldered on was damaged.

Possibly more than one pin, as well.

 

[GrumpyMan]

Bad port, got fried, hope you have another one?

 

[Pohemi]

But the red tint isn't there when the HDMI cable is not connected.

So the display/colors appears 'normal' when connected with a DisplayPort or VGA cable, I take it?

As others have stated already, it sounds likely that the HDMI port itself (or the connection points on the pcb) is the culprit.