HP Pavilion problem

[DubbDesigns 10+ year member]

I have an HP pavilion desktop and it had what seemed to be a power supply problem, but i hooked up a known working power supply and it is doing the same thing.

It used to start up to the HP screen and power off or the screen would go black and sound like it kept trying to turn on but the HDD just kept coming on for a split second and then go back off and it would keep doing that until you unplug it.

The HDD works, I tested it in another computer. I also disconnected all the drives and everything but the mobo just keeps doing the same thing.

Now when you press the power button the fans all turn then it goes back off after a fraction of a second. There is alot of dust inside the computer and the case has been sitting on carpet so I was told so is it possible for the dust to generate static electricity inside the case and short out the MOBO?

Seems like MOBO problem to me. its an Asus p4g533-la mobo. what do you all think?

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[_DjScrew_ 5,000+ posts]

no beeps or anything?

 

[crunktimes.com 5,000+ posts]

I typically unplug all my components and boot up just the PS and MB and see if it stays on, if so start adding things back one at a time.

 

[_DjScrew_ 5,000+ posts]

I typically unplug all my components and boot up just the PS and MB and see if it stays on, if so start adding things back one at a time.

yep. including power switches, etc. I use a screw driver to jump the two pins where the power connector would go. I had a machine back when i worked for the school district that I could not figure out for the life of me.. and it turns out it was the **** power switch.

 

[DubbDesigns 10+ year member]

when i first got it a few days ago it was beeping but that was because the ram fell out, i put it back in and it stopped beeping but continued doing the same thing.

I unplugged everything but the mobo and still has the same problem

 

[cajun_duck 10+ year member]

definately mobo says me.

 

[oldschool4me 10+ year member]

definately mobo says me.

yea, i would take all the good components out and start over with new case and mobo or buy a new mobo.

 

[DubbDesigns 10+ year member]

cheapest new mobo i found on google search was $209 new and like $49-99 used on ebay. I consider it trashed anyways.

If it were my machine i would take out the P4 cpu and put it in place of my shitty celeron in my linux machine.

 

[loopkiller 10+ year member]

You have what we call vapor lock. It is a phenomenon that I cannot explain that happens all the time. You need to disconnect all of the power connections from all of your devices and mobo. Unplug the AC too. Now take a paper clip (or similar metal object) and bend it so you have a U shape. Stick one side into the ATX connector where a Black wire resides and the other where the Green wire reside. Now plug in the AC and see if the PSU stays running. These are the two wires that the mobo use to turn on the PSU.

If your PSU stays running, now unplug the AC, remove the paper clip, and re-attach the ATX connector to the mobo (and the 12v+ P4 if there). Without the AC plugged, short the power pins on the mobo 3-4 times. Now plug in the AC and short the power pins on the mobo and it should fire up.

 

[DubbDesigns 10+ year member]

You have what we call vapor lock. It is a phenomenon that I cannot explain that happens all the time. You need to disconnect all of the power connections from all of your devices and mobo. Unplug the AC too. Now take a paper clip (or similar metal object) and bend it so you have a U shape. Stick one side into the ATX connector where a Black wire resides and the other where the Green wire reside. Now plug in the AC and see if the PSU stays running. These are the two wires that the mobo use to turn on the PSU.
If your PSU stays running, now unplug the AC, remove the paper clip, and re-attach the ATX connector to the mobo (and the 12v+ P4 if there). Without the AC plugged, short the power pins on the mobo 3-4 times. Now plug in the AC and short the power pins on the mobo and it should fire up.

I think i enjoy living to much to try that

 

[loopkiller 10+ year member]

I think i enjoy living to much to try that

I am dead serious. The most that ever comes out of a PSU is 12v. Don't think that will do you much harm. I have been a PC tech for over 15 years now and this is common. What I said before is step by step what you will need to do to fix it for free. Or you can buy a new mobo or throw it in the trash. Your call.

 

[loopkiller 10+ year member]

^^^^ That

 

[DubbDesigns 10+ year member]

You said its called vapor lock? I cant find any info on google about it. If I had a little more info on it i might try it but i dont want to go playing around with electricity until I am sure that it will fix the problem.

 

[DubbDesigns 10+ year member]

By shorting the power pins on the mobo do you mean the pins where the power switch connects?

 

[vgeek 10+ year member]

I don't know what this "vapor lock" is, so you should probably be wary of trying what he's telling you to do. It sounds like a bad motherboard, I had one go bad on me a year or two ago and had the same symptoms as you. Just look on newegg or buy.com for a mobo/cpu deal that is compatible with your current type of memory and you'll be good to go. I got a cheap ECS one with a better processor for like $60 and its still working fine.