The colors of my laptop are twisted

Hello.

For a while, every time I've booted up my laptop, the colors of it have had a chance of being twisted (as if they had been inverted, but since that's not exactly what has happened, I don't know how to properly explain it). However, everything usually went back to normal either after a reboot or clicking around enough. Right now though, it seems like the messed up colors are here to stay.

Everything else works fine, it's just the graphics that are a problem, leading me to believe something's wrong with my graphics card, though I'm unsure of exactly what to do. Can I hope for the colors to return to normal like I have in the past - there was a month where this problem didn't occur at all, leading me to believe this was a temporary quirk - or should I just buy a new graphics card? I'm not exactly sure how I would go about installing a new one.

The computer's a four-year-old ASUS running Windows 10.