What’s wrong with my computer?

I received an Alienware custom built desktop awhile back. I’m not sure when it was first made but the power supply is only a 150W. When I first used it, it was working perfectly but then after a week or two it would turn on but nothing would show up on the display. I figured maybe it was time to replace the... show more I received an Alienware custom built desktop awhile back. I’m not sure when it was first made but the power supply is only a 150W. When I first used it, it was working perfectly but then after a week or two it would turn on but nothing would show up on the display. I figured maybe it was time to replace the graphics card and the power supply. I did and the computer started working fine again but now I’m having the same problem. You can hear it booting up but no display. (Also the new graphics card and power supply are not Alienware, too expensive. The new graphics card is EVGA GeForce GTX 1050 Ti and the power supply is EVGA 850GQ.)
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