PC running but no signal on monitor upon boot

[Synt4xie]

When I turn on my pc, there's no signal on the screen till Windows starts to load. Sometimes i have to unplug the HDMI to VGA adapter plugged into the GPU HDMI port and replug it for PC to detect any display. After I get a display the PC works flawlessly. Even if there's no display, my PC still boots up in the background and I can shutdown using keyboard w/o any issue.

I usually service this by third parties. After servicing, it works flawlessly for a few weeks then same old "no display" issues start happening.

What exactly is the problem? Monitor? GPU? Adapter? HDD? Mobo? Ram? 

Specs:

MSI A320m Pro-VD/S mobo
Ryzen 3 1200,
MSI GTX 1050ti Armor 4gt OC
Gskill Ripjaws v 8gb 2666 single channel ram
Toshiba 1tb hdd
240GB l3 evo ssd
Antec 450w bp450 psu
some old LG monitor with vga connection

[TheFlyingSquirrel]

if you don’t see the post screen then something is wrong with boot.  Do you have another monitor you can test with?