[crjdriver]

I have runned the PC without CPU

How in the world did you do this? Unless you have a dual cpu type board [not dual core] and pulled one cpu, it is NOT going to run without the cpu.

[babba46]

If all you did was move your PC to another location, it sounds like a bad connection somewhere. Try to re-seat ALL of the connectors several times especially the PSU connectors.

[lolerguy]

The pc doesn't even start up at all. When i click on the boot button, it runs for about a half of a second. Then shuts down.. It doesn't go to the bios menu or anything.

I testrun it with a normal source ouput, not with a surge protector. And what i meant with taking out unimportant parts, is that only the motherboard is running, not even the cpu is on (Have also tried with CPU on). No oher extra wires and such. Just the motherboard...

And i did not replace the cpu fan, only tried to take it off and on...
And at last: The mobo doesn't seem to have any input for a 12v processor, so i think that this is not the problem.

PS: Remember that i wrote:
But one day when i had to move it to a new spot, it suddenly didn't want to start up...

Well, here is what happened Exactly:
The old PC (Which is the one having these problems) was inside my brothers room. It worked like a charm and had no problems. My room is next to his, and i thought that it was time to get it into my room. So i gently moved it into my room. Here, i set i up with power and such. I clicked on the boot button on the pc, i hear it running for 0.5 second, then it shuts down... Nothing else. Clicking on the boot button again, and it makes no reaction at all. Only when i pull the power cable out for a short period of time, it will reset, and then the same problem comes again...

So... I hope this can help you guys even more about what could cause the problem. And that is EXACTLY how it happened..

Oh yeah, before i moved it in, i had not touched anything inside the PC.
All of the wires was checked after problem to see if any wires had fallen out. Checked the cables, but this was not the case...

Im sorry if my english is a bit bad... Not from England, nor USA...

[crjdriver]

No problem with English.

My guess is that the pw supply has failed. What you describe; ie remove the power cord and it resets so it can attempt a start is a classic pw supply problem.

I would test by swapping in a known good pw supply.

[lolerguy]

Ok, i got this extra reserve PSU with 500W (The old one was on approx. 230w) The new one is from OCZ and should do the trick (I hope..)

It has the same cables as the old one, so ill reply back in a sec or two...

[lolerguy]

Sadly, i get sort of the same problem, with only 1 slightly change:

I plugged in the new OCZ PSU. Only the motherboard powercord is plugged in. The small change is that now, the cpu fan doesn't start up at all, but now the fan on the PSU just ticks, ready to rotate, but again, same problem. I am starting to think that either the Mobo is touching the casing, or the mobo powerslot is broken... Could i be right?

EDIT: I can first reply in a couple of hours (You know, sleep...)

[babba46]

crjdriver made a sticky at the beginning of this hardware forum about "problem builds". Even though this is not a new build, you can treat it as such. Building outside the case is an excellent way to troubleshoot problems like this. Before you remove the motherboard, see if any of the screws are missing and try to locate them. Screws can come loose and fall out from hot/cold cycles and vibrations from fans over time if they weren't tight to begin with.

[win2kpro]

OK, try this procedure. The procedure must be done exactly as described.

Start the machine, and if it is as you described it should cut off immediately.

Don't touch anything, but try to restart the machine with the power button. Does the machine restart?

If the machine doesn't start, unplug the power supply from the source for 20-30 seconds. Try to restart the machine. Does the machine restart and shut off immediately?

If the machine restarted and shut off imemdiately, are there ANY USB devices connected to the machine. If so, disconnect ALL USB devices and try to restart. Does the machine restart then shutoff immediately with ALL USB devices disconnected?

If the machine runs with ALL USB devices disconnected then one of the USB devices is drawing too much current from the USB connector. If the machine continues to shut off with no USB devices connected then the problem very likely is in the +5 motherboard stop/start circuitry.

When moving the machine (especially an older machine) it is very possible that one of the +5v traces on the PCB cracked.

[lolerguy]

Uhm, i always feel like a noob when i come to this site, so what exactly is a +v5 trace? If you have a pic, then it would be perfect, but its also great if you just could describe it :P

And of course, are there any ways that i could use to fix this?
(The PC doesn't have any USB devices connected when i test it. Only the power cable is plugged in...)

Thanks
Jake

[win2kpro]

If you take an old motherboard and turn it over and look at it with a magnifying glass you will see hundreds of printed circuits with numerous junctions. These are trace circuits.

The motherboard uses many different voltages for different functions but +3.3v and +5v are the most common. As the board ages, due to heat and age some of the circuits may crack since they are very small in diameter. The +5v circuit controls the starting and stopping of motherboard functions, and if a circuit is cracked it will disrupt the power flow through the circuit.