Hi, I want to use the DC power supply disconnected from the motherboard. When all connectors to the powersupply are disconnected the fan in the power supply is not rotating and no 12 volt DC is delivered. How to simulate the the function of the pomother board?? Ingemar

The power supply connector might be not place properly. Check the connector in the motherboard there might be one missing that is not being connected the processor connector located near the processor itself...then check also the connector of the cooler fan...it might not be connected...
If all the things is in place but still the problem is exist. Replace your power supply with new...because there might be a defective component into your power supply which is not enough to supply the entire motherboard...

Yes you can as long the motherboard power connectors fit your motherboard.

http://www.intel.com/support/motherboards/desktop/sb/cs-012037.htm

mobo is bad have it checked...

The motherboard LED is supposed to glow, indicating that the board is residually powered, after disconnection
of external power and as a warning of this condition so that you will not further disconnect or connect any
peripherals until the charge on the power retention capacitor is properly dissipated.

The Power Supply and Processor Fans should only run while power is applied, and if the Processor fan is always running at a high, possibly noisy, velocity, additional Processor Cooling may be necessary by means of a higher efficiency heat dissipation system.

If you remove memory from the board, the system should not initiate, as memory has little or nothing to do with
the problems you cite, but everything to do with the proper initiation of your system.

Buy a larger Processor Fan Assembly and those symptoms you cite which actually are problems should cure
themselves, while those symptoms you cite which are not problems will still not be problems.

if everything is ok with the cables and all are in the wright place, try powering up the pc using a different power supply.if that fails...should be the motherboard..

Power supply fan needs +12 Volt,
LED needs +5V, can you measure the voltages?
black: ground
red: +5V
yellow: +12V
there are more voltages on the mainboard connector:
-12V,-5V,+3.3V
pls check
If one of them is missing, your powersupply is dead

have u check ur memory?... ur videocard and powersupply...thats the main problem of pc if it has no display....just try it one by one...hope it can help u

Hi,

DDR 333 memory is DDR PC2700, I believe. It might be hard to find a new MB that will work with that. You'll probably have to buy new memory. You'll also need a new CPU fan, unless you know the Socket type of your existing MB. But you should replace the fan anyway on a new CPU/MB install. You should buy as much memory as you can afford.

Try looking HERE and see if anything is in your price range.

Hope that helps...

Geno

Are there any beep/s sound that you can hear when you try to Boot your desktop? If there are none then do some check the following: 1. Please check if you have properly connected the connectors for ATX 20 pins powersupply and for ATX 12V Power Connectors. 2. Press the POWER Button to turn ON your Desktop and Check if the Powersupply FAN is spinning to ensure that there is Electricity power for your Powersupply BOX. Then press (approximately 5 secs) the Power Button if Turn Off again. If its shutdown then your motherboard is OK. But when you press the Power Button and you hear a sound like a BOAT's Horn/Fogging sound then your Power Supply is not sufficient to provide power to your Desktop or CPU.. 3. If you got 2 or more memory Cards installed in your motherboard then try to install those Memories one at a time. To determine if one of those card is defective..