Acer Veriton z290g making a high pitched whistle

[Sualk]

When I put my computer to sleep, it stops, and it starts as soon as I turn my computer on. Changes frequency right before the login screen comes on, and then it stays the same after that. My PC also takes a while to start up now. I have to shut it off and back on maybe 2-3 times before it'll boot up. Just a few minutes ago, Windows sent me to this uh... resume(?) screen that I've NEVER seen before.

Are these 2 things completely unrelated? Could I possibly have a virus that's causing this?

edit: it also changes frequency during windows' admin program run notification

 

[Sualk]

My computer's having more problems starting up. It goes on and off, and my mouse flickers with it. The whistling constantly changes frequency during this time.

sorry for double posting/bumping, but I really need help with this. it's an all-in-one computer btw.