Damien Symonds

Of course, best in the world. But you've come this far, maybe you should try it, at least?

Oh! That's DVI, not VGA. That's absolutely fine. But you'll need a hdmi-to-hdmi cable to test your screen with your laptop.

Keep trying. It's REALLY important that you have no VGA pins involved in this.

So you had a cable that was hdmi at both ends?

Oh shit!!!!!! Ok, that might explain a lot. Is there a HDMI port in the back of your computer? Your real computer, I mean.

That's right. Then go to the Display Settings control panel and make sure the it's set to "Extend":

Great.

Remember, the assessment of colours must only be done in a colour-managed program. So if you don't have Photoshop on the laptop, you'll need to install Bridge.

It's ok, that will work. Plug your desktop screen into the laptop computer and calibrate it there. See if the same magenta problem exists. I should have asked this sooner - what kind of cable is connecting your screen to your computer?

Ok, it's time to do some tests. Do you have another screen you can plug in to the computer and calibrate? If that was high in magenta too, it would point to a graphics card issue.

Ok, good.

Ok, this scares me: You have to find that setting in the screen's menu and make sure it is turned off.

Is it this monitor?

Yeah, that's fine.

This one? https://www.asus.com/sg/Monitors/ML239H/

Remind me what screen you have again? Is the brightness a match now?

Yeah, I guess so.

You boost up your screen's brightness, then calibrate again.

Sorry, I meant the colour. Yeah, go ahead and recalibrate.

Yep, White LED should be correct. How's the colour of the dog's fur in this print?

I find that very hard to believe. It's not THAT old. Are you sure you've got all the settings correct on this screen? https://www.damiensymonds.net/wp-content/uploads/2015/12/cm02-1.gif

Hmmm ... then the problem must be the new graphics card in the new computer, I guess.

Ok, thanks. Yeah, that's what I found when I tried proofing your photo with my lab's profile as well. Ok, so that means that there IS a problem with your calibration. Is anything new in your equation? I mean, how long have you had the calibrator, and how long have you had your computer, and how long have you been calibrating the latter with the former?

Yep, those settings are perfect. So you're toggling Ctrl Y to turn the profile off and on, and you don't see any change?

May I see a screenshot of your custom proof settings?