Monitor doesnt display properly

[JonasMM]

My monitor displays this image:
[IMG alt="proshop-MSi" width="640px" height="479px"]https://i.ibb.co/ynb65Wg/proshop-MSi.jpg[/IMG]

It only happens in the first 2-5 min of starting my pc. or if it has been on sleep mode for a long time.
it doesnt do it if i connect a my mac but it still does when the monitor is starting up like the image shows
how can i be certain its the gpu and not the monitor? or could it be something else?

[Rustys]

Remove the display card and use the onboard if you system can.

Other wise use a known working display card.

Put the Display card into a different system doe the same thing happen.

With out complete system specs make and model of would only be guessing.

[JonasMM]

Remove the display card and use the onboard if you system can.

Other wise use a known working display card.

Put the Display card into a different system doe the same thing happen.

With out complete system specs make and model of would only be guessing.

CPU: intel i5 9400 f ( without dedicated graphics )
GPU: GTX 1070 Nvidia geforce
Motherboard: ASUS ROG strix b360-f Gaming
RAM: HyperX fury DDR4 2666 16 GB
PSU: Corsair VS450 v2

Monitor: MSI 27" MAG271CQR

OS: Windows 10 Pro N

Dont have other gpu to test with, but thanks for quick answer

[Rustys]

GPU: GTX 1070 Nvidia geforce

PSU: Corsair VS450 v2

Replace the power supply the display card that you have requires a 500 Watt.

https://www.nvidia.com/en-in/geforce/products/10series/geforce-gtx-1070/

https://support.lumion.com/hc/en-us/articles/360003476773-Which-power-supply-do-you-need-

VS = value series and only any good for integrated graphics.