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download Windows Boot Genius and install it into the computer, instert a usb flash drive or cd then run the software to burn it into a recovery disk. boot your computer from the usb and restore the system.
the fan in your computer is constantly running to cool down the cpu and it is normal for it to increase it's speed, your fan should run quietly even it increases the rpm. But if you hear a loud noise in the fan, i think there's something wrong with it. I suggest for you to check the fan if it's coming in contact with anything. If the fan is visible while your laptop is operating, you can observe it to know what is really happening. I don't know what type of fan hp uses on their laptops, maybe something is loose already on the fan so better check it or bring it to a service center.
I understand that your cpu is not turning on and the repairer confirmed that it is the issue with the mother board. I suggest you to please check the smps fan spinning or not. If its spinning then then the issue could be with the mother board. If not try changing the power cables.
Next check whether your cd rom light is glowing. Even if there is an issue with the mother board, as the power is supplied by the smps the light should glow if the light is not glowing its clear that something must be wrong with smps.
Please provide us the result of the above steps so that I could assist you further.