PSU man, PSU. Power Supply Unit. Also, I have eliminated the PSU, the fans, and the HD from the equation. All I am left with now is that irritating little speaker on my mobo itself, and I have no idea why that would squeal. I recommend SilverStone PSUs, I have a 460 and 600 watt models running my desktops respectively. 1000RPM 120mm fans at 16db for very quiet performance. I'd just unplug the case speaker motherboard connection as any boot error is going to give you a display code on modern boards anyways. Most use to do beeps only a morse code style manner of short and long beeps to indicate an error code that could be looked up the owner's manual, other than troubleshooting, no reason to plug that in at all.