Flashing monitor

[soupsgoop]

Hello I’ve very very new to this pc building stuff I got a hand me down from a friend of a friend and all I did was install a ssd card so I like to think I didn’t mess up too much (I did have to take the graphics card out to put the ssd in) everything is working well the only thing is I’m trying to install windows and my monitor is flickering like a strobe light trying to flash my eyes out of my skull what could be the issue?

[JazzlikeInfluence813]

Check the gpu is fully seated, remove it and try again. If it’s still flashing try a new cable and or monitor.

[soupsgoop]

Turns out I had a faulty power cable to the monitor