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Qdi motherboard only 200watt power supply hooked up and the 4 12v pin is not hooked up computer turns on but moniter doesnt

I have a qdi motherboard and i put a 200 watt power supply in it well it needs to have a 4 12v power hooked up and the moniter wont turn on or none of my drives but the computer turns on

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You need min 250w power supply with the right connector.
do not try to splice any of the power wire. it will work but you will get burn later.

Posted on Oct 14, 2008

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When my computer is on the moniter is blank.


The monitor only has one cable and it is keyed to fit one way. They are always located under the top bezel. Should have roughly 20 pins and the wire will flow up into the display. If the screen is very very dim (look carefully) then your inverter board is most likely bad these run 40-120 dollars depending on model and are located along the bottom edge of the display itself. If the screen is completely black, try plugging an external monitor into your laptop (make sure you try toggling the display mode) [typically Fn + F7 or whichever says LCD or has a monitor icon.] If the external monitor works then your screen is most likely the problem and will need to be replaced. If the monitor does not work, the motherboard needs to be replaced. You will be hard pressed to find any schematics for motherboards but you could dis assembly the the laptop and easily check for descended capacitors, burns and the light though most of the time I doubt you will be able to see the damage.
Best of Luck

Jan 24, 2012 | System Power Supplies

2 Answers

I just built a new computer and when i tried to boot it up nothing happened. The Corsair ax850 PSU isn't even "humming" or giving any indication that it has power. The 110v wall plug has power....


You won't get any 'fireworks' or 'smoke', widsss.

A) Make sure the Power On switch is connected to the correct pins, in the Front Panel header on the motherboard.

(The Front Panel is the plastic front of your computer where the Power On button, HarDDrive activity LED, Power On LED, etc., is located.
The pin area on the motherboard that the Front Panel cables (Wires) plug into, is the Front Panel header)

Either you do not have
1) The correct cables (Wires) plugged into the motherboard from the Front Panel,
or,
2) A bad Power On switch,
or
3) A bad Power Supply
Even if the Power Supply is brand new, it can still be a dud.

There is a simple test to see if the problem may be the Power On switch, or the Power Supply.
After you have made sure the problem is not incorrectly attaching the wrong wires, from the Front Panel to the motherboard, reply back in a Comment, and I'll detail out the simple test for you if you wish.

ALSO:
B) Make sure the 4-pin ATX +12 volt power cable is plugged in, if your motherboard uses it.
It's power for the Processor.

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

C) Your motherboard may not use a 4-pin +12 volt power cable. It may require more power.
In this case an 8-pin EPS +12 volt power cable is used. The equivalent of two 4-pin +12 volt power cables.

http://www.playtool.com/pages/psuconnectors/connectors.html#eps8

(Note*
1) Red wires are 5 volt
2) Yellow wires are 12 volt
3) ANY Black wire you see is a Ground wire )

I await your findings.
Regards,
joecoolvette

Mar 07, 2011 | CORSAIR Professional AX850 ATX12V and...

5 Answers

There is no power switch on the enhance atx 1123b that I have . What actually powers it up?


Just about every power supply I've owned doesn't have a power switch. The power supply is turned on by one of the wires in the 24 pin connector. According to this it looks to be pin 16 and how to turn it on:

"Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF."

Hope this helps

Ray

Mar 01, 2011 | Enhance Technology ATX-1123B, Enhance...

1 Answer

My compter is dead, and I just want to verify if it is the power supply, motherboard, or power switch. I have a EG351P-V. If I completely remove it from the computer, plug it in, and turn on the switch on...


No, don't start shorting anything yet! Here's a picture of the power connector:

pgh_pa_guy_11.jpg

Turn on the power switch on the supply, then short the green PS_ON pin (pin 14 or 16 depending on the style plug your supply has) to the black ground pin on either side next to it. DO NOT short across the plug to pin 4.

If the supply is working, this will cause the fan to start up and you can measure output voltages as shown on the diagram. (In fact, this is how the motherboard turns the supply on. The supply provides a 5-volt standby output as long as it's plugged in and turned on to keep the motherboard running to detect the power button. When you press it, the motherboard provides the PS_ON ground to fire everything else up.)

Be aware that without the load provided by the motherboard and other parts of the system, you may be able to measure output voltages (especially if you're using a digital meter) that may not be sufficient to run the system under actual operating conditions. Bad capacitors can cause the voltage to drop when loaded, and this will cause the dead system or other strange troubles. The best way to determine if a power supply is causing problems is by substituting a know good one into the system.

Dec 19, 2010 | Enermax (EG351P-VD) (eg351pvd) 330-Watt...

1 Answer

I recently purchased a Dynex 400 watt atx power supply for my Dell optiplex gx280 (slim form). The reason I did this is I have a new PNY geforce 8400 GPU and my old power supply is only 160 watts (1/2 the...


Sounds like the power supply is not compatible with the motherboard. If the motherboard can't support a 400 watt powers supply you will either get a blinking light or nothing at all. Those optiplex's use a proprietory power supply because of the pin connectors and how a power supply is supposed to fit in there. If you can't find a 400 watt power supply that fits then get a hold of Dell and see if they sell one for that computer.

Sep 22, 2010 | Dynex 400-Watt ATX CPU Power Supply

1 Answer

Do you have a diagram that would show me step by step how to install the new power suply I bought for my computer.


Their is really no diagram to show you how to hook up your supply.
You only have a hand full of plugin connections.
Your 24 pin connection to the mother board, you may or may not have a 4 pin 12 volt video connector, which has to be connected if on the board., and your fan connections.
Everything else is controled thru the motherboard.

Nov 25, 2009 | MGE 400W Power Supply (QG) Power Supply

1 Answer

When i turn the power on the green power supply light goes out and doesnt turn onand the computer wont turn on


Follow these:
  1. Unplug the computer.
  2. Disconnect the power supply from the motherboard and all other accessories.
  3. Replug the power supply.
  4. Connect the green wire (PSON) of the power supply by way of a jumper wire to any black wire (ground).
  5. The power supply should turn on with its fan. If not, it is defective and should be replaced.
  6. Check the ATX12V connector of your motherboard. It is were you removed the 4-wire, 2 yellow and 2 black, connector of the power supply. Check the continuity of the yellow wires to the black ones. It should be open, otherwise it is shorted and your processor is defective and should be replaced.






Aug 19, 2009 | E-Machines Emachine T5026 power supply **...

1 Answer

Power supply not working?


To see if power supply works
unplug the psu from the motherboard and drives
then plug the power cord into psu and wall
the fan should come on letting you know that it works.

you can also get a multimeter and check each individual connector on the 20/24 pin connector to motherboard.
check the psu docs for the correct voltages to each pin

If you smelled smoke then chances are that something may have gotten toasted.
remove all expansion cards and try to turn on computer if nothing happens then the motherboard may have gotten toasted.
Check the motherboard and expansion cards along with memory for shorts and burn spots.

A+ Technician

Apr 02, 2009 | HP HEC HP485D 485W ORION HP485D ATX 12V...

1 Answer

When switch is turned on alarm sounds and there is no power


It could be a cmos battery boot it in bios and check for flagged components, if u do not find anything try it with another power supply as this could several different problems

Dec 18, 2008 | Powerline 200Watt DC to AC inverter...

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