When the machine is turned on there is a humming

The F61 message means that the system is blown. Try reading the manual to see more in depth what they say to do. Also, try unplugging the system, leave it sitting for about 5-10 minutes so the electricity will fade out of it, and disconnect anything going into it (IE speakers, inputs) anything that will disconnect, and then plug it all back in. But according to knowlage and research, it means its blown.