I recently built my first PC, all works fine except it makes a weird screeching noise. I don't know what this is and I am worried. My fans are working as that SAS s uggestion from a friend. I can supply a YouTube link of the sound!
Check to see if a wire is touching a fan. It happened to be, after i turn on my pc i would hear a weird noise until i realised a wire was touching one of the fans.
If that's not the problem, keep your ears near your tower to spot where it is coming from. Could also be a bad fan.