Vostro 7500, HDD not installed error and alarm

Happened to me too. While I am using my pc and there are no problems, but sometimes after a couple of hours I only see a brief blue screen with error code "SYSTEM_SERVICE_EXCEPTION" and the pc just shuts down before I do anything. And after that, I hear the very loud beep alarm sound, and it doesn't stop till I press the power off button. There, I see white screen On-Board Diagnostics, with error "Hard Drive - Not installed" and error code 2000-0155.

I ran all the diagnostics, no problem found. But I still upgraded my pc to Windows 11 and did all the upgrades, no help.

While I was trying to upgrade my pc to Windows 11, I also had blue screen errors with code "UNEXPECTED STORE EXCEPTION" couple of times without a beep sound this time. 
Like you said @JOcean, I also have a new SSD, which shouldn't cause any problem. 

My PC is 2.5 years old and doesn't have warranty, Do you think there is anything I can do?