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pc will not power up

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my nephew bought alll new parts to build a new pc : ASUS m2n68 motherboard ,AMD phenomx4 9450e cpu , 2gigs ram , ultra x cpu cooler it was a complete barebones . Now the motherboard lights up cpufan kicks in then stops tried in a different case to see if maybe was the switch no luck please help

19 replies

by bikerwill

i have never done that before yep i am still learning i have put together several pcs in the past but never had a problem till now lol

by nicknielsen

Do you hear it beep? Do you get a monitor display at all? If not, make sure your CPU is properly inserted and secured. Make sure the memory is in the lowest-numbered slot (0 or 1, depending on the mainboard mfr).

And, as Santeewelding noted, check the power connections.

by thechas

Make sure that the clear CMOS or reset jumper is in the normal or run position. This is usually not connected.

Next, make sure that the power supply is a good match for the motherboard and that ALL power connections to the motherboard are connected.

Also, make sure that the CPU is supported by the revision and BIOS version of the motherboard.

It never hurts to take the time to check all of the jumpers and connections on the motherboard.

On a few systems, I have had to reset the CMOS so that the BIOS would detect the installed CPU.

Chas

by bikerwill

that was the one from tigerdirect canada i tried a different power supply the cpu fan will stay running when the 4pin is not plugged in but after its plugged in it shuts off

by ansugisalas

That just means that the buttons do the wrong things, right?
This sounds more basic.

Try taking it all apart again, and starting over. Be pedantic in following the (amended) instructions of the manual... make sure that you're careful of making assumptions.

by bikerwill

Thanks everybody :
It turned out the cpu was not locked in properly I reseated the Cpu and locked it in with the lever cleaned up old compound and used new compound and The computer now Boots up many thanks

by nicknielsen

I certainly hope you've not been plugging and unplugging connectors while power is applied.

Which 4-pin connector are you referring to? Your system should have at least two: the ATX12 connector (the one with black and yellow wires coming from the power supply), and, from the looks of things, the connector from the CPU fan. Both of these will need to be connected properly for the system to work.

In fact, if the black and yellow cable is not connected to the motherboard, the system [u]will not[/u] boot.

by bikerwill

no it will not boot when all wires are connected and turn power on it seems like it is powering up the cpu fan starts to spin then shuts down but there is still power coming to the motherboard the light on the board stays lit

by nicknielsen

the capabilities of long-distance troubleshooting. You need to check the output voltages from the power supply, if you know how. Connect a multimeter between the black and yellow wires and you should see 12VDC±.2V, between the black and red wires and you should see 5VDC±.1V.

Insert the black lead from the meter into the ATX12V connector at one of the black wires (push it down next to the wire). Insert the red lead at one of the yellow wires. Do the same with black and red on the ATX (20-pin) connector. If you already knew this, ignore the previous paragraph.

by nicknielsen

You probably have a bad mainboard or processor. You may wish to have a local professional check the system.

by ansugisalas

Check one component at a time. Be pedantic.
Check all the switch-settings... CPU power settings from the CPU manual... just like on the first try.

Sometimes it's just an insertation problem, sometimes an overlooked setting.

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