Help Computer Will Not Turn On

[Captain Chaos]

Stolen from another forum but may help you:-

UN-plug the power supply from the wall........... (or turn off with the switch on the back of the supply)

Then WAIT until the GREEN LED on the motherboard goes Off.....

STEP #1 : Now...

- remove ALL the RAM sticks
- remove all SATA cable completely from the system (yup pull 'em out and set them across the room...)
- unplug all the hard drives, DVD drives, and floppy(hey ya might have one... ) from the power supply
- unplug all fans from the motherboard
- unplug the 4+4-Pin ATX 12V from the CPU, yes, unplug it too
- unplug all the front panel switches
- unplug all front panel USB cables
- unplug the front panel audio cable
- unplug your mouse, keyboard, or any thing else you have connected to a USB port

There should be no wires, cables, or devices of ANY kind connected to the motherboard...............


The ONLY cable from the power supply that should be connected to ANYTHING is;
- the 24 pin cable to the motherboard



Turn the supply back on....

If the GREEN LED on the motherboard still blinks:
- its the CPU
- or the motherboard
- or the power supply


STEP #2 (If the GREEN LED on the motherboard still blinks)

Next step would be remove the power supply and motherboard from the case. Set them on a non-conductive surface, like card board. Connect just the 24 pin cable again. See if the LED blinks when the supply is turned on. (some times the metal stand off's or the screws holding down the motherboard to those stand off's cause a short circuit. Sitting out side the case on card board we've eliminated that possibility)


STEP #3 (If the GREEN LED on the motherboard still blinks)

Remove the CPU from the motherboard....

Turn on the power


STEP # 4 (If the GREEN LED on the motherboard still blinks)

The motherboard is bad....
Or, you just have a bad power supply


The GREEN LED is powered by the 5 VSB power. That LED should not blink if the voltage remains on and steady. Were trying to find out if something is pulling that voltage down (or shorting it out...)

 

[MikeTheNative]

Yeah, back in business. Replaced the mobo and it worked.

 

[wazza300]

that's good news

 

[MikeTheNative]

that's good news

Trying to return the faulty MB to gigabyte as I only had it 11 months. My cheap £35 micro ATX will have to do for now. I also have a brand new unopened PSU I have to return to Overclockers.
Thanks for all the help.

 

[MikeTheNative]

Well ******* **** computer turned off last night and now will not come back on again. Seemed to be working fine with the new MB, now I have no idea what to do.

 

[Monkeh]

What PSU are you using and do you have surge protection on your power adapter?

 

[On Holiday]

Well ******* **** computer turned off last night and now will not come back on again. Seemed to be working fine with the new MB, now I have no idea what to do.

Any LEDs lit up on the motherboard?

 

[MikeTheNative]

I've tried two different PSUs and I do have surge protection plugs which are still lit. The motherboard doesn't have a light it seems.

 

[kaka4200]

I really hope it gets fixed :/ by reading the thread all the options have already been suggested. Goodluck m8

 

[On Holiday]

Have you tried it outside the case? Possibly something shorting mobo out?

 

[MikeTheNative]

Have you tried it outside the case? Possibly something shorting mobo out?

I will try that but if it was that then wouldn't it have not worked from the beginning?

 

[MikeTheNative]

I tried it outside the case + removing cmos battery, RAM etc and still nothing. I also tried a new CPU and still nothing. Have I really had two motherboards go in a week? Could it be the PSU taking them out?