Power supply Someone switched the toggle on the back of the power supply from 115 watts to 230 watts,
I was told the pc had no power so I started trouble shooting. I seen the toggle switch on 230 so I put it on 115. Allthis was done while I was unplugged from my power source.
I turned on,,or rather tried to. No power.
I removed power supply and was ready to go buy a new one when I was told to move the switch to and from 115 -230 a couple times before I put it back in.I did. It powered up but no monitor. CDROM works,CDRW,FLOPPY,,all have power but monitor is BLACK. Whats wrong.
Is the MB fried.
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Re: power supply
Usually this will damage the power supply only.
To make sure your that your motherboard is working, try to find a working power supply unit and connect it.
If it does not work your motherboard may be get damaged. Also check for warranty.
If your system contains a graphics card, check that too, it may also get damaged with voltage variations.
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What is happening? Primer; You press the Power On button. This plastic button in turn, presses against the Power On switch. A Momentary Contact Switch.
The brief closing of the Power On switch, closes the Soft Power On circuit, in the Power Supply. The Power Supply turns on.
The first chipset to receive power is the BIOS chipset. The BIOS program starts.
BIOS looks to see what devices are connected, does a Ram Memory count, TURNS the Processor on, and hands the computer over to the Operating System. (Windows XP, and Windows 7, are two examples of an O/S)
When BIOS goes to turn the Processor on, the Power Supply 'falls flat on it's face'.
Has to enough power to light a few little LED lights, and maybe spin a fan, or two, but NOT enough power for the Processor.
The monitor is stating No Signal, because there is no video signal coming from the computer. This is because the computer is not working, because of that bad Power Supply.
[Weak voltage power rail ]
Want to know how to test the Power Supply? Post back in a Comment.
Good day , you may need to power-off her PC, open it up, and give it a good
cleaning with a vacuum cleaner. If possible, after you've got her PC
open, and before you clean it, turn it back on so you can figure out
which fan is causing the noise problem (many PCs have more than one
fan). If it's the CPU fan, then you're going to want someone who is
comfortable and experienced with removing it and replacing it with a new
one, because it is EXTREMELY important to get 100% physical contact
between the CPU chip itself and the cooling fan/housing that is attached
to it, or the CPU is going to overheat and destroy itself within seconds
of being turned back on.
If the noise turns out to be from a normal case cooling fan (3-5 inches
across), you can try cleaning it really well to remove any dust, and see
if that fixes the problem. If not, you can buy a replacement fan of the
appropriate size at pretty much any PC store for $5-$20. It takes 5-10
minutes to unscrew the old fan and install the new one, and just use the
same electric wire from the old fan for the new fan.
If the noise turns out to be from the computer's power supply, you
cannot repair it, so it needs to be replaced. I would recommend either
replacing it yourself, or having someone who has done it before replace
it for you. There's usually only 4 screws that hold the entire power
supply box in the case, and then you also have to unplug the power cords
that go from the power supply to the hard drives, floppy drive, CD
drive, other internal peripherals, motherboard, and fans. Carefully
remove the entire power supply box from the PC case, being careful to
not scrape it or bang it against any of the memory cards or other
internal components. Take the noisy power supply with you to a discount
computer store and find a new power supply that's the same physical size
and at least as many watts as the current one (usually 350-500 watts).
If you go with a generic power supply, it will probably cost around $30.
If you go with a name brand, high-wattage power supply, it can cost $100 or more. Hope this information help you in resolving your issue. Have a great day.
either you have bought an incompatable chip for the mother board. or your power supplie is not powerfull enough I know this sounds stupid but it happened to me when I upgraded to a P4 3.6 quad core I installed the lot and it wouldnt start up I had a good power supply too Get your self at least a 500 watt PSU
Some power-supplies have a rocker-switch, with a '|' and an 'O' icon, which acts as a "master" power-switch. Be sure that you have pushed down on the '|' side of the rocker. As you do so, look at the motherboard -- it may have a small green lamp on it, to indicate that the motherboard is receiving power from the power-supply. Also, look at the fans -- they may slightly "rock" (twist back and forth) for a moment as you move the switch.
Most of the connections to the front-panel can be ignored while "trouble-shooting" your problem. As long as the two "power" pins on the motherboard are connected to the "power" button on the front panel, pressing the "power" button should work as expected.
Hi jderek4, try this. locate the toggle switch on the back of the power supply. Just find it do not flip it.
Plug the PSU's power cord into the PC. Just as you got a good connection & the PC begains to power up move the toggle switch to it's other position. The PC should power off that very second.
If the PC does not shut off than the PSU is bad. If it did shut down wait a few seconds. Press the cases power on button. The PC should start to boot up. Let it finish loading. Click the start button & choose to shut down windows. The PC should shut off.
Yes? If not than your back to (bad power supply). Swap it out.
Try a few things for me OK? From what you typed, turned on the psu "the toggle switch on the psu", pc seemed to be starting up. I need you to keep the toggle switch on the power supply in the on position. Press and hold the start button on the PC case to shut it down. Give it a few seconds & power up by pressing the power switch on the case. Notice a differance? Next, unplug everything connected to the pc expect the monitor, mouse & keyboard. Try to boot. Still no? Remove the side of the case exposing the board. Turn the psu off by flipping the toggle switch on the psu, wait till the green light on the board goes out. Grab the Mb ( I know it's tight in there) and see if you can move the board in any direction. Not loose? Re-check all data & power connections for a solid connect. Re-check your case to Mb connections. Also check the PSU, there is a red slide switch it should be set to 115v. Post your findings..