Question Is this a dead pixel ?

Aeacus

Titan
Ambassador
Is it dead smack in the middle of the screen?

Since it looks too big to be a dead pixel. Then again, i don't know how close you took that pic.

Simple test: make a screenshot within Win and look if it shows up. If it does, it is generated by GPU/system. If not, it is generated by the monitor.

But at 1st glance, it looks like sniper dot, IF it would be in the middle of the screen.
E.g from my MSI monitor settings or included software, i can enable "Screen assistance" in form of all kinds of sniper crosshairs, that are displayed dead center of my screen, regardless the application i use.

MSI screen assistance looks like so:

Overview_OSD_-_FPS.png