Again, sorry for the delay.
You appear to be suffering some level of component failure.
With the system unplugged, disconnect the hard drive ( power & data cables ). re-plug the machine & power it. Then see if you get more than fan noise i.e. beeps or screen display.
If you do, then the inference is drive failure & you will need to get it replaced or repaired. On the other-hand, if you still get no sounds other than fan noise then it's time for a trip to your local repair shop. There would be too many variables to perform a remote diagnosis.
Good luck. Let me know