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AT power supplies typically use a mechanical button or switch to turn on. Depending on the age of the device, however, it may not be safe to activate it without a load, however. If no motherboard is attached, other devices that draw lots of power, like hard drives, should be attached.
Wiki User
∙ 14y ago
Wiki User
∙ 13y agoYou can test a power supply by shorting out the green wire on the 20/24-pin motherboard connector to any black (ground) wire. An easy way to do this is with a bare metal paperclip bent to fit the connector.
The power supply shouldn't be run for extended periods of time without a load. Remember that the standard voltages are 3.3v (orange), 5v (red) and 12v (yellow). Some power supplies have more than one 12v rail. The additional rails will sometimes have a colored stripe along the wire. For example, the 12v2 rail might be a yellow wire with a black stripe.
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What is the purpose of a power cable?
To provide power to the power supply which in turn powers the motherboard.
Does the power supply provide power to a CPU fan or case fan?
yes, the power supply provides power specifically to the motherboard in turn dispersing power to all components plugged into the motherboard, hope this helped :)
My mother boards Led light wont turn on?
Your power supply or motherboard has a problem.
Which PINS on the 24 PIN motherboard connector coming from the power supply can be shunted to turn the power supply on?
15 & 16 and 16 & 17
What are the symptoms of a faulty power supply?
PC will not turn on and no LEDs come on at all. Sometimes, though, this can be a motherboard problem as well.
Your computer will shut down when you turn on it?
Bad PSU, (power supply). Did not install motherboard right in case, and bad ground.
How do you get an ATX power supply to turn on?
ATX power supplies do not have dedicated switches. They are signaled to turn on by a small button plugged into the motherboard and placed on the front of the computer case. It is possible to force an ATX power supply to turn on by running a wire between the PS_ON wire (the green wire) to a ground wire (a black one).
What is the main function of PC power supplies boxes?
The PC power supply box's function is to supply the computer with power. Without the PC power supply box, the computer would not be able to turn on and off.
PC wont turn on Power supply and CPU turn on for 2 seconds and then stop Replaced power supply but does the same thing?
If you've replaced the power supply with a known good power supply (I've seen more than one case where the 'new' power supply was defective) there are 2 other things I can think of that may be causing this. First of all, it could be that there's a cooling problem with your CPU. More than likely, if this is the case, the heat sensor on the motherboard that lets the computer know the CPU temperature is faulty. This is fairly rare. My second idea, unfortunately, is the motherboard. There just aren't too many things that cause a computer to turn off that quickly. One good way to make narrow it down to the motherboard is to strip it down to just the CPU and motherboard and power supply. Disconnect all drives and remove all add-on cards (video, sound, NIC, etc.) The goal isn't to get it to boot per se, but to see if it stays on. You should have ONLY the motherboard with the CPU and power supply plugged in. If it DOES stay on, start putting things in one at a time to figure out what's causing the problem. If this doesn't help or you need additional info, let me know and I'll get back to you ASAP! :)
Why would a computer work if the cord from the power supply to the mother board doesn't have enough pins?
Not all pins are needed in a given configuration. Another possible scenario would be if your motherboard requires a 24 pin adaptor and the power supply only has a 20 pin interface. In this situation, the 20 pin could be plugged in and might provide adequate power to operate the basic components to make the system turn on and run. However, you will have power deficiencies most notably to the CPU. This could in turn be harmful to CPU, motherboard, power supply, etc. by components demanding more power than the available conduits can provide.
Is power supply a component of CPU?
CPUs get power from two places-- From the motherboard through the tiny pins on the bottom of the CPU (Which in turn gets power from the 20 / 24 pin connector that connects tot he power supply) and from a 4 / 8 (Only on the newest boards) - pin connector that directly feeds the CPU a very steady supply of power. Both come from your actual Power Supply.
What feature does the ATX motherboard use that allows software to turn the power on and off?
Soft Power
