Power problem

[laracroftlover]

I have a new pc that I built and all of the parts are bought and put together and when I tried to power up it would go on but a second latter it would just quit and just power off. At first I thought that the PSU had died but then I tried to power it up without the power connected to the CPU and it turned on, so I thought I did not have enough power and bought a 750W and put it in but still the CPU would not power up so is it my motherboard, are there wires crossed and I have to get a new motherboard, all of the parts a compatible so it has to be the motherboard Right?

[blue60007]

Try this:
http://forum.pcmech.com/showthread.php?t=132409

Could be something as simple as a short with the case.

[minsonngo]

What are your system specs? Brand and model of each component please.


Are you sure your cpu heatsink and fan is mounted properly and installed securely? This is the leading cause of issues like yours.

Do you have standoffs mounted between your case and motherboard?

[laracroftlover]

i have a ASUS P5B Deluxe, Intel Core 2 Duo E6700 Conroe 2.66GHz 4M shared L2 Cache LGA 775 Processor.

these seem to be the parts with the Problem, and i put every thing in right. so it must be some thing wrong with the Motherboard. O, and it not the case i checked, its fine. and i do have standoffs mounted between my case and motherboard.

[minsonngo]

Have you tried the outside of the case build? It really helps troubleshoot your problems:

http://forum.pcmech.com/showthread.php?t=132409


What is the brand and model of your PSU? Both of the PSUs you have tried please.

Please give us a list (brand and model) of all of your parts. We need all the information you can give us to help you out.

[Cricket]

Originally Posted by laracroftlover I have a new pc that I built and all of the parts are bought and put together and when I tried to power up it would go on but a second latter it would just quit and just power off. At first I thought that the PSU had died but then I tried to power it up without the power connected to the CPU and it turned on, so I thought I did not have enough power and bought a 750W and put it in but still the CPU would not power up so is it my motherboard, are there wires crossed and I have to get a new motherboard, all of the parts a compatible so it has to be the motherboard Right?

You can't just assume the problem is the motherboard...you have to go through your troubleshooting procedures to slowly eliminate each possible cause of this problem until you find the component that is causing the problem.

Are you sure the CPU heatsink is installed properly? If you install the heatsink while the motherboard was already in the case chances are the heatsink is not installed properly. The LGA775 heatsink is difficult to install if the motherboard is in the case so you'll want to remove the motherboard from the case and re-do the heatsink installation. LGA775 heatsink installation tutorial.

What brand power supplies are you using?

Are you trying to power up with everything assembled together already?

Cricket

[laracroftlover]

Sorry for taking so long I could not get to the internet in the past few days, but here is every thing I bought,


(This is the PSU I had) CORSAIR CMPSU-520HX ATX12V v2.2 and EPS12V 2.91 520W Power Supply 100 - 240 V UL, CUL, CE, CB, FCC Class B, TUV, CCC, C-tick

(This is the PSU I have now) SILVERSTONE DA750 ATX12V / EPS12V 750W Power Supply 100 - 240 V

Thermaltake Armor Series VA8000BWS Black Aluminum / Steel ATX Full Tower Computer Case

ASUS P5B Deluxe LGA 775 Intel P965 Express ATX Intel Motherboard

Intel Core 2 Duo E6700 Conroe 2.66GHz 4M shared L2 Cache LGA 775 Processor

Hauppauge WinTV-PVR 500 MCE White box PCI Interface Personal Video Recorder

Western Digital Caviar RE2 WD5000YS 500GB 7200 RPM 16MB Cache SATA 3.0Gb/s Hard Drive

CHAINTECH GSE76GS GeForce 7600GS 512MB 128-bit GDDR2 PCI Express x16 Video Card

LITE-ON Black 20X DVD+R 8X DVD+RW 8X DVD+R DL 20X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM IDE DVD Burner

ARCTIC COOLING Freezer 7 Pro 92mm CPU Cooler

Creative 70SB046A00000 7.1 Channels 24-bit 192KHz PCI Interface Sound Blaster X-Fi XtremeGamer Fatal1ty Professional Series

CORSAIR ValueSelect 2GB (2 x 1GB) 240-Pin DDR2 SDRAM DDR2 667 (PC2 5300) Desktop Memory

One more thing what power cord am I to use for the Core 2 Duo Processor the 4 pin or the 8 pin???

[laracroftlover]

O, and I did take every thing out of the case and rebuild it on the table and still the same thing happend and I even started it up with only the CPU fan the CPU the video card and the ram and it still did the same thing.

[Alaron]

The Asus P5B has both a 24pin main ATX Power Connection and a separate 4pin (2x2 square) power connection up near the CPU socket. Do you have both of them plugged in?

[Cricket]

Originally Posted by laracroftlover One more thing what power cord am I to use for the Core 2 Duo Processor the 4 pin or the 8 pin???

If the power supply has an 8 pin power connector, plug that one in.

Cricket

[laracroftlover]

Yes I have the 24pin power cord plugged in for the motherboard’s power and the other 8pin plugged in to the place next to the CPU.

[minsonngo]

Try leaving only one stick of memory in at a time. Also double check and make sure everything is installed properly and reseat and reinstall everything just to make sure [redo your CPU heatsink & fan just to be sure also... if you have the retail boxed version of the CPU... try installing the heatsink & fan that came with it instead of the aftermarket one you have].

Try clearing the CMOS also.


Although rare with ASUS boards... it could be a faulty motherboard.

[laracroftlover]

And it makes a sound before it turns off. is like a shorted out kind of sound…

[laracroftlover]

What is a CMOS???

[minsonngo]

Originally Posted by laracroftlover What is a CMOS???

Check your motherboard manual for instructions of clearing the CMOS or resetting the BIOS. Usually it will be a set of pins where you have to move the jumper over. Or you can pull the CMOS battery out for 15 minutes.

Originally Posted by laracroftlover And it makes a sound before it turns off. is like a shorted out kind of sound…

That does not sound good... can you find out where the sound is coming from?

Do you have everything going through a surge protector also?

[laracroftlover]

Yes I have everything going through a surge protector and the sound only happened once and it came from the power supply. The power supply did not die, it still powered the rest of the motherboard its just keeps quitting on me when the power is connected to the CPU.

[minsonngo]

Originally Posted by laracroftlover Yes I have everything going through a surge protector and the sound only happened once and it came from the power supply. The power supply did not die, it still powered the rest of the motherboard its just keeps quitting on me when the power is connected to the CPU.

What do you mean by "the power is connected to the CPU"?

CPU = processor... the power is not connected directly to the processor.




Did you try everything else I suggested?

[Cricket]

Originally Posted by laracroftlover What is a CMOS???

The CMOS (complementary metal oxide semiconductor) is the little memory chip that hold the BIOS (basic input/output system).

Originally Posted by laracroftlover The power supply did not die, it still powered the rest of the motherboard its just keeps quitting on me when the power is connected to the CPU.

It's beginning to sound like a defective motherboard to me.

Cricket