I recently RMA'd my Asus Sabertooth 990FX for a replacement, and up until then, my power supply has been fairly silent. After I put the new replacement board in, as soon as I plugged it in and turned it on, I heard the squeal. I put my ear up to the power supply, and it's definitely coming from there.
What would cause this all of a sudden..? The new motherboard is the problem, or the power supply? It seems odd that it would just suddenly start doing this. It may also be worth noting, the squealing changes pitch depending on what I'm doing.. Like for example, when I first started my PC this morning, and I opened up Chrome and all my web pages were loading, it was squealing pretty aggressively all of a sudden, with a higher pitch. Weird huh?
Dont have any spares to try, no.. What I don't understand, is how everything could run perfectly fine before, and right after, with all the same parts except the new motherboard (same model), the high pitched squealing.
Could it possibly be the motherboard? I put my ear up to the sound, and it's hard to tell if it's coming from the power supply, or the bottom of my motherboard (my case mounts the power supply at the bottom of the case, right below the motherboard), but it's definitely one or the other. I noticed the sound changes even when I'm in the BIOS, when I move my mouse around or click stuff.