LaserJet Printing

I've used only HP printers for decades and have never had a problem until now, so thank you, HP, for such great products! Unfortunately, my HP CP1518ni color laserjet printer will not print in color. It worked fine on all versions of Windows until Win10. It also worked on Win10 for awhile, but then one day it suddenly stopped printing in color.

Of course, I checked the ink and ran a test page, which printed in perfect color. I have scoured the internet and these forums and tried every fix, but it will not print in color. My entire reason for purchasing this product was to print with vibrant color. I need the printer to work. 

This thread purports to "solve" this problem: https://h30434.www3.hp.com/t5/LaserJet-Printing/CP1518-suddenly-won-t-print-in-color/td-p/6268496

I followed all these steps but the printer still doesn't print in color when I use MS Word or another program; but the test page always prints in color.

Please help me solve this problem. I've spent approximately 10 hours now, trying to fix this issue. Please post a fix for me, or tell me where to go where there is help that can solve the problem.

Thanks much!