Dell Inspiron 15 3511 Hard Disk not installed

Hi! I have a Dell Inspiron 15 3511. It randomly gives blue screen while using it and when I try to turn it back on it always gives the error "Hard Disk not installed". Dell SupportAssist at startup doesn't work either.

This issue is random but happens constantly. I tried several things such as turn off RAID and reinstalling Windows but nothing seems to work.