HELP! Monitor won’t display anything after unplugging from power!

I bought this viewsonic XG027qc on marketplace. As soon as I brought it home and plugged it in I had this same current issue. No display. The built in speakers worked just fine. But no display or OSD. Not even a “no signal”. Then as I’m messaging the seller that it’s not working, I press the power button and it miraculously works!! The splash screen shows up and everything. I kept it on for like a week since then just incase, and tbh I’m pretty sure I’ve turned it off once or twice and it turned back on no issues. But I unplugged it from the wall today and when I plugged it back it, it was back to the same black screen. No on screen display. The backlight works and I made sure to sign a flashlight to make sure. Plus, I mean I’m almost positive. It isn’t the backlight because it started working. After it had this issue the first time. if anyone has any ideas of anything that would help, please let me know. I’m hoping it will just randomly start working again, but I’ve tried power cycling and doing everything that I’ve read online so far.