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My computer won't turn on, but the power supply blows air

by zero1007 / June 30, 2004 12:04 PM PDT

I was replacing my processor fan today with a new fan, as the old one was incredibly noisy (in an old HP Pavilion 8590c, if that matters). Anyway, I installed it just fine, booted up the computer and it turned on for maybe 10-15 seconds.

Then it turned itself off and now it wont turn back on. I know a good deal about computers, so at first I figured it was a power supply problem. I tried hooking up my other computer's power supply (550w compared to the HP's 160w). The same thing happened:

The computer wouldn't turn on or boot up anything. Yet, the power supply (in both cases) blows out a small amount of continuous air as soon as I insert the power cord into it. I dont have to turn the computer on (as that doesn't even do anything). As soon as I plug it in, the power supply sends out a small amount of air, and the computer remains unresponsive.

I tried removing everything from the power supply (hard drive, floppy, etc), as well as removing devices from the motherboard (soundcard, RAM, graphics card, etc). That didnt work.

So now, I am wondering if the motherboard in the HP Pavilion 8590c crapped out. Could the new fan have fried it out? ANY IDEAS?

Thanks in advance.

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Re: My computer won't turn on, but the power supply blows ai
by R. Proffitt Forum moderator / June 30, 2004 12:16 PM PDT

The 8590c appears to have a P3-600 MHz CPU. The FAN for that CPU may require that third wire for speed monitoring and that "could" cause the machine to not boot if the incorrect fan is used.

Double check this and your work.


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Re: My computer won't turn on, but the power supply blows ai
by zero1007 / June 30, 2004 1:09 PM PDT

i tried the old fan in there (it used to work before), and that doesnt work either.

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Then you are squarely in repair mode.
by R. Proffitt Forum moderator / June 30, 2004 10:58 PM PDT

You get to strip it down to just...

CPU/HeatSinkFan(HSF), PSU, Motherboard and Speaker and see if it beeps. If not, it's one of those parts.


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Re: Then you are squarely in repair mode.
by zero1007 / July 1, 2004 1:48 PM PDT

The problem is that I can't get it to beep, since it doesnt boot up.

I plug in the cord to the wall, and the power supply fan starts up really weakly, but the computer stays turned off. Then I try the power button, and it clicks, but doesnt turn it on.

Could my motherboard be sending faulty signals to my power supply?

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by R. Proffitt Forum moderator / July 2, 2004 1:52 AM PDT

I don't go for "boot" which I define as the bios showing on screen and more, but simply beeps of protest about missing RAM, video and more from the machine.

Let me ask POINT BLANK....

Did you strip it down to the four parts?

If so and it doesn't power up, then we can do two less parts. Remove the CPU and the Speaker. What happens when you try it?


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Re: Beeps.
by zero1007 / July 15, 2004 9:15 AM PDT
In reply to: Beeps.

Okay, sorry for the long time between replies.

Anyway, I removed everything you said and nothing.

I removed everything BUT the processor (I cant get the damn thing out of there!), and nothing happened. Although now the power supply doesn't blow a small amount of air upon plugging in the machine. It only does that when I hit power.

Do you have any experience with removing the processor/heatsink from HP Pavilion PCs? I can't find the original instructions (although i doubt that would even be in there).

Is there any hope for me left? Or can you narrow it down to a cause of my computer not powering up?

Thanks for your help thus far and any new insight you might be able to give me.

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Beeps. You want beeps. redux...
by R. Proffitt Forum moderator / July 15, 2004 9:35 AM PDT
In reply to: Re: Beeps.

You are actually making progress. It appears you got it down to just 3 parts and was able to power up. But without the speaker, the test is incomplete. We gotta hear those beeps of protest or we are looking at 4 possibly bad parts.

Hope you understand and hope it narrows it down.


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(NT) (NT) FYI. Reply up higher to continue.
by R. Proffitt Forum moderator / July 15, 2004 10:14 AM PDT
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