Power Supply Fault

Can you here your hard drive spinning?

And do you know how to use a voltmeter?

It would be very helpful if you could find another power supply unit to use, this would answer the big question of wether it is you PSU that is faulty and not supplying your PC with enough power to run properly.

There is another way which might work if you don't know how to use a voltmeter, try disconnecting all of your drives except for the HDD and then see if it boots up.

If it is the PSU then this can affect the amount of power that it can supply, and your PC will try to use more power than the can be supplied.

Regards

Martin