Question about HP Pavilion a305w (DM181AR) PC Desktop

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System fan computer not running , checked setup and reading that system fan not spinning (0 rpm) checked cup, and found no visual problems with any fans.

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  • lesbn man Jan 09, 2008

    i mean cpu

  • lesbn man Jan 09, 2008

    what would be the problem then?

  • lesbn man Jan 09, 2008

    when i start my computer , it runs, then stops and goes back to the window that asks me if i want to run the computer on safe mode, safe mode with networking, safe mode with command prompt, or start up computer normally. When i run it on safe mode, it goes back to the safe mode window.

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Lesbn man, if by your second post you mean the CPU fan is not spinning then that is likely the cause it won't boot. When the CPU overheats it'll start to do calculations wrong (causing a fault + restart or hang) or the BIOS will shut down the machine to avoid damage. Either one will keep you from getting into windows.

> Check for dust buildup on the CPU fan housing that could be keeping it from spinning. If clogged , blast it out with canned air.

> Check the power lead coming from the CPU fan to see if it connected to the motherboard.

> If you feel comfortable doing it you can further isolate the problem by plugging the CPU fan into one of the other 3 prong jacks that you have a WORKING system fan. If it spins up when you turn on the machine it's not the fan and you probably have a software config problem. Don't run it in this state for long (by that I mean seconds not minutes), you're just trying to see if the fan works at all. If it does it's likely what Nick described above.

Posted on Jan 26, 2008

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You may have less fans than possible readings. That 0 rpm fan may be absent and so it is not the problem.

Posted on Jan 09, 2008

  • Nick Spirov
    Nick Spirov Jan 09, 2008

    Please describe your problem.
    If you successfully entered Setup then the computer IS running to some point. Your problem should show later.

  • Nick Spirov
    Nick Spirov Jan 09, 2008

    Your problem is with Windows, possibly not hardware-related at all, or due to a recently changed drivers or system settings. Select the "last known good configuration" from the menu, if that doesn't help and you can't go even into Safe mode than you'll have to reinstall Windows (keeps your programs and data) or use restore disks supplied (and lose your data)

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Fans not working in hp pavilion p7 1003w


Are you sure they are getting power? Check by using a plug off of an old fan. Power it up and read the voltage on the red and black wire. Should be 12 volts. Check by swapping SYS FAN With JP1. If there is no voltage then I would say your looking for a burnt or bad voltage regulator on the board. It could also be a bad power supply. Use a Q-tip to first spin the fans with the PC off. Do they spin freely?
25386666-d5sfsixxp3s0mc4y4voabxpt-2-0.gifMother Board
If they dont, replace them. If they do spin free, turn on the PC.(Make sure to go into the bios setup so id doesnt continue to boot.) Try to spin the fans now. If the dont spin free, it means there is voltage there, but the fan is toast. Replace them.
FOR A QUICK FIX: If it is the power supply or MB . They sell an adapter that plugs into the HD power. get as many as you need and a power splitter or two depending in your power supply configuration. Plug the fans into the adapters then go into the bios setup and disable the fan warning. The fans will be on high at all times. The MB will have no control over the speed. Good luck. Hope this helps.

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1 Answer

New case fan running but still getting error message system fan failed.


Did you try;

Power off, power unplugged to computer.
Press the Power On button, and hold it in. Hold for a count of 10 seconds.
Let go.

Do this procedure two more times.

Plug the computer back into power. WAIT 1 minute, turn the computer on.

This method clears CMOS Error Codes, and sets BIOS Setup back to the factory default settings.

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00864946&tmp_task=prodinfoCategory&cc=us&dlc=en&lang=en&lc=en&product=3340228#N436

CPU fan spinning at required minimum RPM's?

Not talking about the SYS_FAN (Case fan)



Regards,
joecoolvette

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1 Answer

My monitor is not booting up but powered up, what is the problem? the fan is real loud but nothing else works


I see this is your second posting. Good for you in adding the additional information.
This may be rather lengthy genevacotton, so grab something to drink, and sit back.

The cooling system for a desktop computer consists of air flow through the computer case.
Air is brought in from the Front towards the Back of the computer. (Or for some gamer computers, through the top, or side, and out of the back)

Air helps to cool the hardware components inside the computer.
A Processor is one of the two main components to develop the most heat.

[ Below shows a typical Intel Pentium 4 processor. Operates at a maximum frequency rate, ('Speed') of 3.0GigaHertz,

http://www.cpu-world.com/CPUs/Pentium_4/Intel-Pentium%204%203.0%20GHz%20-%20RK80546PG0801M%20%28BX80546PG3000E%29.html

Under the bold black heading > Intel Pentium 4 3.0GHz RK80546PG0801M ( BX80546PG3000E),
look at the tabs >
Specifications, Pictures (3), CPU ID, and Comments (0)

Click on > Pictures (5)

You can click on any of the photos to enlarge.

The photos show the top view of a Processor.
The silvery looking square case in the middle is the Processor chipset.
The Green square surrounding it is a circuit board.

Click on the third photo down. The one under 2008-10-05 14:56:45

Holding that circuit board up off of that flat black surface, are pins. These you do not see in the photo.
For this particular Intel Pentium 4, there are 478 pins.
This Processor fits in a Socket 478 processor socket.

http://en.wikipedia.org/wiki/Socket_478

The photo shows the top of the Processor's case, with No Heatsink sitting on it.

This is a typical Heatsink/Fan combo,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=262455&CatId=493

The Heatsink is the aluminum looking square object under the fan.
Your particular desktop computer may not use a fan on top of the Heatsink.

It may have a Fan in the front which draws air through a plastic tuned port.
The plastic tuned port in turn, then goes over the Heatsink sitting on top of the Processor.


Case in point with all of the above prattle?

The Thermal Paste used in-between the top of the Processor's case, and the bottom of the Heatsink, has dried up.


The top of a Processor's case, and the bottom of a Heatsink, are not perfectly smooth.
A microscopic view would reveal 'Pits, Hills, and Valleys'.
When the two surfaces of the Heatsink's bottom, and the Processor's top are put together, the before mentioned imperfections create Air Pockets.

AIR is an Insulator. Not a Conductor.
Thermal Paste is a Conductor. It conducts heat from the top of the Processor's case to the bottom of the Heatsink. and fills in the imperfections.

When thermal paste dries up it looses it's conducive properties.

The fans are designed to spin at an RPM, (Revolutions Per Minute), that is in compliance with the needed cooling for the Processor.
Processor isn't running very hard, fan/s spin at normal speed, (RPM)

Processor is running hard from multiple programs running, or intense games, the Processor heats up, and the fan/s spin faster.

Whenever the Processor heats up past it's thermal limit, (Maximum operating temperature), the fan/s spin faster.
If the Thermal Paste is dried up, the Heatsink, and Fan cannot cool the Processor properly.
The signal is given to the fan/s to speed up, but they still cannot cool the Processor.

The Processor overheats, and shuts off. The fans still spin at max RPM.
No computer operating, fan/s spinning at high RPM.

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1 Answer

My system fan speed reads 0 rpm and the computer powers down


Check to see if your fan is plugged in correctly.
If it is and still doesn't work, try plugging the fan into another fan port.
If it still doesn't work, your fan is probably busted.

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Dell Dimension C521 power shuts off spontaneously


Procssor over heat can cause this kind of problem
check your processor cooler

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1 Answer

Hp Mecia Center m7060n fan failed, new fan not detected


the fan must be the correct fan
i guess you meant the CPU fan, ? desktops can have 2 or 3 fans.
the fan has 3 wires, in many cases, the 3rd wire is a RPM tachometer that if not correct the PC can not read RPM
if RPM reads 0 the PC will be very upset. and do that.
my guess you bought the wrong fan, and is super easy to do
giving the many fans
on some PCs the BIOS monitors the fan RPM and heat sink temperatures, or both, and tells yous fan bad for either failing

on my PC here, now, I can go in to bios and see both live sensors
RPM and Temperature. this allows for easier diagnosis
i dont think your PC has that page in BIOS to do monitors for trouble shooting, in fact mine has 3 fans all 3 are monitored, now.
high end PC .

this older desktop , only the m7200 pages are there. at hp.
so cant look at the fan nor BIOS.

i use a windows program that lets me watch the fan speeds
and all CPU and GPU core temperatures. (ask) its free.
the troubleshooting guide at HP stops short at this problem
says get it fixed. so you want to fix it your self sure.
so talk to one of the top, CPU/HEATSINK/FAN makers
and buy this from them.
if the fan spins fast and RPM is 0 wrong fant
if the fan spins fast and RPM is ok, then the BIOS dont like the CPU temperature... this has 3 causes.
fan dead. or slow. or wrong fan installed
heat sink fins packed in lint as all do ever year.
heat sink thermal bond compound failure, common.

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Cpu fan noisy/chip fan fail error messages


pils,

Yes. This sounds like a fan issue. The noise often comes from bearings failing within the fan. Also, a failing bearing can make things harder on the motor as it brings the fan up to speed. This is likely the reason that you see increased warnings during the fan speed check while booting because it comes to speed more slowly as bearing wear increases.

I give this a 90% chance that your CPU fan is causing the issue. Since a decent CPU fan will cost you ~$20 online, it's not much out of your pocket if you happen to uncover another culprit.

I'll keep an eye on this post. Let me know how things go.

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Core fan Abnormal - Fan Speed 0 rpm - System slowdown


Well, since you connected your fan directly to the power supply, you are not getting any feedback thru the graphics card interface. This doesn't mean there is a problem since your fan is running full speed all the time, it is actually better and you should be able to see a difference on the GPU temperature.
If the GPU temperature is still too high and the fan is running at full speed, did you apply a thin coat of thermal paste on the heatsink? if not, there is your problem.

Now just to be clear did you connect the fan to the power supply or to a spare motherboard connector. If you connected to your motherboard, you need to go in the BIOS and change some settings regarding the fan speed (let me know if this is the case and I'll help you further about that.)

Alex J.

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1 Answer

Rpm's and graphics


Hi Naida, A while back I had a computer that was having all kinds of video issues after it had been on for a little bit. I pulled the video card out and like you was able to free spin the fan and didn?t see any dust worth mentioning. Also like you I ran the computer with the case open to verify the fan was actually spinning but noticed there really wasn?t much air being moved. I removed the fan from the card and to my surprise found that the cards heatsink directly underneath the center of the fan was blocked with a solid ball of dust I couldn't see before. Cleaned that out, reassembled and I was good to go. If that doesn?t do it you might consider replacing the card fan. They?re small, cheap and run full board on gaming machines. Since you?ve gotten some messages indicting your software detects 0 rpm it would be a logical and cheap thing to try. Let us know if this works and please don?t forget to rate this post.

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