558 Views. Computer’s power supply unit (PSU) is connected to the motherboard. Dear all. You must buy the right power supply for your PC. Computer problem? I unplugged power wires from everything but the 20 pin ATX and 4 pin to the mobo and turned it on again, same high pitch sound. Disconnected all case connections except for the speaker. power supply or motherboard failure? The only thing I could find online about it is this: M3970AM-HP (Angelica) My PSU is a Corsair, somewhere around the 700w range. Note: you can take help from the motherboard manual to check how PSU and BIOS work. PSU is as important as motherboard but it is underrated or even neglected. hello. Load the power supply with 6 fans, 4 hard drives, 3 optical drives, and anything else you can plug in and see if it stays on. That means the motherboard acts as a heart like a heart in a living body. Just because the power supply fan or the CPU fan is spinning and the power LED lights are on doesn't necessarily mean your power supply is delivering the necessary voltage to your motherboard. Failing power supplies are common and can cause your symptoms. So I shutdown another computer that was running fine and took the power supply out. A bad power supply can be the root of many PC problems. Sure enough the high pitched sound is still there. The most frequent reason for symptoms like yours is the power supply is failing. There are 4 supply voltages you should have at the 24 pin connector. Unfortunately, many of … Failing to boot or power on indicates a bad motherboard, but it can also mean your power supply is dead or dying. When a Motherboard dies, the situation gets really tough to identify and understand. Yesterday, I did big trouble. 5 Solutions. If you have a spare power supply or if you know someone who has, work your way to get a hand on it and try it on your motherboard. For PSU, if the load is too much, the insufficient power supply to the system even damages other components. Start with a new PSU and go from there. Usually flashing lights on a motherboard indicate a faulty or misconnected power supply. What happened was that I have another old computer that is not on any. Then open your ears wide open to hear a short beep. Symptoms of a failing computer power supply There are a few telltale signs of a computer power supply that may be failing. AMD 64 2300+, Asus K8 xx board w/ 754 chipset. Lv 4. In short, you should have an excellent quality of power supply and keep checking it. The only things the … Bad Power Supply Damage Motherboard Power Supply Protector. Fans, drives, and other peripherals may spin up if the motherboard is dead, but more often nothing at … My motherboard is an OEM thing from when I first got this computer, it's mostly stock except for the graphics card, PSU, and the case itself. Your can verify the power supply voltages at the 24 pin connector on your power supply when it is in a good and failed state. Sometimes, this is accompanied by the flashing lights at the back of the computer or … there was a very large thunderstorm very close to my house a few days ago, and a lot of electronics in my house stopped working. Next, unplug the power supply from the wall, and then disconnect all of the power supply leads from the motherboard, the video adapter, any auxiliary fans, the DVD. Take it out of the computer and connect it to another to see if the PSU is at fault, or borrow one you know is working to test it in your system. Last Modified: 2013-12-11. I … You have classic symptoms of a power supply on it's way out. Failure to turn on at all is an indication that there is a problem with the power supply. Disconnect the motherboard and connect as many things as you can to the power supply then force it on. 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