What can cause a motherboard not to start up. I just need to know it works so what does it take for it to work at bear minimum. I just want to see a light flicker or a fan spin... somthing.

Just the mobo, PSU and CPu with cooler on, that should be able to take you to BIOS at least if it works.

Raj

Toasters,

If you don't have *any* power, then it could be the power jack on the mobo or the dc converter. Of course, it could also be your battery, but you should be able to run directly from wall power and bypass the battery. You should verify you're not getting power by touching some of the chips on the mobo to see if they're hot. I have a power problem with a laptop where I know the embedded controller is getting power, but every thing else on the mobo is apparently dead. Good luck!

I have a computer which does not power on despite the fact that the power supply is working. what might be the problem?

what exactly des it do when u try to power it up? Any beeps, any movemnt of fans...anything at all?

Is it a laptop or desktop?

Raj

Now what happens is that when powered on, no beeps, no movement of fans and also no light in the motherboard at all.

it is a desktop.

please help

Yep check the main power connector to the board itself. Just pull it out and stick it back on again, making sure its not lose or anything. It should be done firmly but without the use of excessive force as that could crack the board as well. So try that and give us a breakdown if something gets goin.

Raj

OK, wat is going on with this thread? Why do we have so many people posting on this thread with the same line on the bottom of their message and are all banned?

Raj

Now what happens is that when powered on, no beeps, no movement of fans and also no light in the motherboard at all.

The purpose of this procedure is to bypass the motherboard to test the PSU.

Caution: This procedure will involve working with live 12VDC electrical potentials which if handled improperly may lead to electrical shock. Proper precautions should also be taken to prevent electrostatic discharges (ESDs) within the case of the computer. For safety purposes please follow the instructions step by step.

First, shutdown your computer. Then unplug the power cable going into your computer.

Once you have opened the case, touch the metal of the case to discharge any static electricity.

The connector of the PSU which connects to the motherboard is readily recognizable by the number of wires in the bundle. To disconnect it you will need to press on the plastic clip to disengage it and then pull the connector up and away from the motherboard. Please take notice of the location of the locking tab and the notch on the socket of the motherboard, this will only connect one way as it is keyed. This wire bundle will have a memory of the way it has been installed and will want to bend back that direction, you may have to play around with it to find a position that the connector will stay in the same position while you run the test.

[img]http://i68.photobucket.com/albums/i35/carn3s/th_main24index.jpg[/img]

From the top left to right the pins are 13-24, the bottom from left to right are 1-12.


Please notice that there are PSUs with 24 pin and 20 pin connectors, the location of the green wire in the 24 pin connector is #16, and the green wire in the 20 pin connector is #14. If you look at the connector with socket side facing you and the clip on the top the number one pin will be on the bottom left corner. This makes the pin out for the 24 pin connector from left to right 13-24 on top, and 1-12 on the bottom. The pin out for the 20 pin connector from left to right is 11-20 on top , and 1-10 on the bottom. If you look at the connectors you notice that these are sockets that fit over the pins on the motherboard where the PSU cable attaches, this is where you will place the jumper. For a jumper you will need a piece of solid wire about the size of a paper clip (20-22 awg), preferably a wire with insulation. It will need to be large enough to fit firmly into the socket so that it will not need to be held in place while testing. You are at risk of electrical shock if you are holding the jumper when you power up the PSU. Insert one end of the jumper into the socket of the Green wire, and insert the other end into the socket of any Black wire.

Once the jumper is in place plug the cord back in. If the PSU is working properly the case fans, optical drives, hdds, and LEDs should power up and remain on. I would suggest that you not leave this connected any longer than is necessary for safety purposes.

To reconnect the 20/4 pin connector unplug the power cord, remove the jumper, and reconnect the connector. Take a moment at this time to make sure that nothing has been dislodged inside the case.