Starting about three weeks ago I have noticed my computer is making a weird electrical hiss sound. Kinda like electricity running even thought my computer is off. The sound is coming from around the power cord/power supply. It does not do it every day but it has been happening more frequently, have brought it into a computer specialist near my house and they did not hear anything. I was told to try changing the extension cord and the thing it was plugged into. I have done that and it didn't make noise for a while but it is back now, have tried plugging it into a different wall outlet and still a no go.
Do you think it is my power supply on its way out? I am thinking of getting a Corsair TX series 750w, current one is a 950w ...name brand escapes me atm. I would like to order it today cause it is on sale on Newegg.
Is the psu fan on top or bottom? Is it free of obstructions? I ask because I had a similar sound on my cpu cooler fan - turned out to be a small piece of a cord "tag" fluttering against the fan - made a sound like a bee.
Bottom fan, and yeah nothing blocking it. It makes the noise when the PC is off, only way to stop it is to pull out the plug.
It almost sounds like static coming from where the plug goes into the powersupply. I was told there is no way its the actual cord that's why I changed everything else. I'm just worried cause if my powersupply fails I know it can damage the motherboard.
I know this is a pain, but can you remove the psu from the case and breadboard it with the other components still in the case. Purpose is to try to localize the sound better and be sure it is the psu and not a nearby board component.
PSU is typically held in place by four screws at the rear of the case.
Bread boarding is "test building" all of the components outside the case to make sure everything works before installation. In your case, I'm just trying to give you a method to isolate where the sound is coming from.
I went ahead and bought a new PSU. Hopefully that fixes everything. With this PC I am looking to eventually switch out my HD too when I boot up it kinda hangs at the motherbord screen figure cause my HD is outdated. Weird though cause it doesn't hang if I open it up and blow out the dust.
Unless you have the wall socket properly grounded, using a cheater plug is hazardous. I suggest you find an electrician to check out your receptacle(s) to see if they can be grounded, or to install a ground fault interrupter receptacle (GFI).