Mac Pro Tower 2010 makes strange noise and won’t boot. White led is ok and startup sound too

I opened the tower and saw that leds 3 and 4 are with a red light on. I was able to turn the Mac on again and still the leds were red. Sometimes it will turn on, sometimes it will do the noise and black screen again

I don’t have a mac keyboard with option and command, I’m using a windows based one. When I was able to turn the Mac on without the strange noise I tried both using f8 command key, F12, windows + r, alt. Each time I was able to turn on I tried a different command, but nothing happened. It justs open my Windows as usual, but I can’t do nothing because the usb ports won’t work.

I’m stuck with two different issues :/

I tried, but nothing happens. My major problem right now is that it doesn’t always turn on. The chime from startup always work, but most of the times I just press the power on button and a strange noise begin, I dont know how to explain but sounds just like a tattoo machine. Everytime this noise begins, the computer won’t boot. Leds 3 and 4 are on a red light.

The noise comes from this green area

So the only solution is to replace the memory slots 3 and 4? Do you believe that if I change that the mac will turn on? Because it does turn on sometimes, and most of the times don’t

and the strange noise when it doesn’t turn on comes from the upper part where the hard disks are… it makes me so confused 😓 When it turns on there is no noise

I’ll try that and tell, thank you so much! It really sounds like the DVD reader running empty, that’s kinda relief 😅