Keys d , . are not working

Oct 2, 2022
It's a desktop, assembled from parts, with gigabyte motherboard. I had switched to legacy boot. I tweaked it a bit tried installing linux lite using ventoy. Then I had installed windows 11 deleting linux lite, installed the drivers using gigabyte cd. Then later when I incidentally happen to use d key, it's not working. Don't know exactly when it had stopped working. I assume all the three had stopped working together. I also have nvidia graphics card. Please help.