Power Up Problems/shorted

Just built a new computer. Everything seemed to be going well, I installed Windows 7 and all necessary drivers. Within a couple of minutes of being in the desktop the computer cut out completely. I tried resetting it but the power button would not come on at all even after pressing the button.

However, the LED's on the motherboard still light up so power is still running through the motherboard, but the system will not power up at all when I press the button. So none of the components will power up or the fans will not come on, but the green LED on the motherboard still lights up so the motherboard has power running through it.

I can't think what the problem was as everything was working initially. I've checked that all the wires are sucrely in place, I'm wandering whether the motherboard could have shorted? Thanks!

Motherboard: ASUS P8P67 (LE)
Intel I5 2400 Processor
GPU: Nvidia GTS450
4GB DDR RAM
PSU: Corsair CX600

 

Did you use enough/too much thermal paste on the CPU?

It sounds like its cutting out due to heat, does the PC POST?
have you checked the fans?


Have you checked for loose stand offs, and wayward screws etc ?

 

Thanks for the reply.

It's not that its cutting out, its that its not even starting.

It doesn't manage POST. When I press the power button nothing actually happens, it does not start up at all (Although the motherboard is connected to the PSU and power is still running through). So the PSU is working at least. Will the motherboard LED's still light up if the motherboard is shorted? Just to note the power shut off when I was using it and it hasn't been on since.

I checked everything is screwed securely in place.

The processor comes with pre applied thermal paste used on the heatsink so this shouldn't be a problem as it is the default stuff used.

I'm not sure what the problem is its driving me mad!

Thanks!

 

Just for the record I do not know one tenth of what Dalo knows and I am only posting here now because he is not on. It is my understanding that while a PSU may be powering the Motherboard so that the lights come on etc. At the same time the PSU may still be defective in that it may not supply power to the HDD etc.

If you have access to another compatible PSU you may want to give it a try. I am only saying that because it can do no harm.

I have no problem with being corrected if I am wrong and, like you, I am interested in Dalo's comments.

 

BeeCeeBee is correct - the m/board LEDs can be lit and there still be a problem with the PSU.

If you have another PSU - give it a try.

No POST is often attributed to PSU or m/board problems.
I would suggest stripping the m/board of all cards and major connections.
Leave only the major connection from the PSU to m/board connected.

Switch on.

You should get POST beeps ( assuming you do have an internal speaker connected ).

 

I don't have a spare PSU to hand at the moment so its a little hard to test. Any alternatives?

I'll go with your advice and remove all the major cables to see if I can get POST beeps (I do have the internal speakers connect). Should I keep the processor in then as it would be a bit more difficult to take out?

Thanks.

 

Just to update I did what you said and took out all the major wires and card and tested it but I didn't get any POST beeps or anything. Wandering what I should do next?

 

I don't have one at the moment. I'm a little anxious as this is not actually my computer this is my friends computer and I'm going away soon so I won't be able to fix it. I'll see what I can do...

 

Touchstone57,

Please confirm:
When you removed the cards etc. you did take out the RAM and disconnected the hard drive and DVD drive power and data cables ?

( There is no need to take the CPU off the board

Something else to try:

With the cards etc removed take the motherboard off ( leave the PSU main connection in place ) and sit it on a piece of card to insulate it. Switch on.
If you get POST now there was a short between the board and the case.

 

I can confirm that I remove all cabling apart from the ones you mention, of course to no avail.

I will be able to test it with a PSU from another computer, and of course I can do what you mention and test if the motherboard has been shorted.

Standby for an update and as ever thank you for your help.

 

Very few MOBOs will POST without RAM, you will just get the fault codes (beeps)

Have you tried resetting the BIOS, using the CMOS jumper? if you are unsure how to do this then:-

Make sure the PC is off and the power supply unplugged from the wall or back of the PC, pop the small watch battery out and then hold the computer power on button for aboub 15 seconds, re insert the battery, plug the power cable in and power the PC on, any POST?