Acer Orion PO3-640 PSU makes noise, and other questions related to my problem.

Hi folks, new here. Im since a couple of days the owner of the Acer Orion 3000 PO3-640.

Little problem shooting here, when the pc is turned off, i hear the psu, the sound is comparible if energy goes trough to something (trrrrr sound), so i have plugged it in a socket with a switch, so when i turn off the switch there is no power to the psu and the sound goes away, but when i flip the switch and the electricity goes to the psu again, the psu is making a sissing sound (sounds like ssshhhhh) so very different sound as when i worked on the pc and turn it off, also when i flip the switch of the socket to on and the pc is still off, my rgb keyboard is lighting up and my external harddrive is running while the pc is still off, add the sissing sound of the psu with it, and it feels not like normal.

I must say other then that i did not found any weird noises and the computer runs fine.

From what i have already read, other psu's are impossible, or you need to be some electronic wizard that can make it work.

-Questions-

1. How do i contact Acer and get a possible new psu? There is no part shop i can find, where i can easily buy parts for my computer.

2. If i would decide to change the motherboard, and with that change to a very common psu, can i just take all the parts that are inside of my computer, and put that on the new motherboard or are these components all modded and fit only on the current motherboard?

3. How long is hardware support for my computer, let say in 5 years or let it be 10, the motherboard gets an error or the psu, can acer still deliver parts in such a timeframe?

4. 1. I have seen alot of driver updates on the acer website, but when i download it, these drivers are in zip maps and are just files, do i need to place them in a certain folder?
2. I have been going to application management and selected all the components, and search for updates but it said, everything is up to date.
3. What is the difference between a driver and a utility?
4. I also see on the webpage bios updates, im kind of scared to do these updates, are they need to be updated in a certain order? from old to new?
5. If i would do all the updates, including the bios updates, is there a chance that the sound of the psu goes to normal in off modus and when i flip the switch of the socket to on but my computer is still off my rgb keyboard does not light up and my external hdd is not running when the pc is off?

Maybe stupid questions, but a little new in this space.
Thank you, bye.

[Edited the thread to add model name]