Question about PC Desktops

2 Answers

Desktop CPU Fan Problem

I have just replaced the psu on my HP PC. The PC went dead and the new psu brought it back to life. Now, almost exactly to the minute when the PC runs for 2 hours, the cpu fan starts running super fast, from 1600 rpm's to over 3600 rpm's even though the cpu is not getting hot. I checked all the voltages and they are on the money. To make things stranger when the cpu fan goes to this high speed for no reason, if I put a load on the cpu the fan slows, yes slows, down to the 1600 rpm speed. This driving me nuts. I have cleaned out the MOBO and air sprayed the entire area thinking it might be a dust problem but no help.

Posted by on

2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Expert
  • 62 Answers
Re: Desktop CPU Fan Problem

My first check would be to see if the manufactuer has a BIOS update for the ma inboard that resolves that problem.

If they don't have one available on their website I would contact their technical support because it may be a known issue that they are currently working to correct.

At least knowing you'll know that a fix is only a few months away.

If the manufacturer claims that your problem can't be verified you may have a faulty thermal control unit on the mainboard.

Let me know what you find out.

Posted on Jan 08, 2008

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 640 Answers
Re: Desktop CPU Fan Problem

Was the psu the exact replacement?did you clock the cpu?

Posted on Jan 08, 2008

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

2 Answers

Blinking orange and blue light

It could be as simple as not waking from power saving or as complex as a damaged hard drive or motherboard
There is a trobleshooting guide here, can you go through it and report back please?
I have assumed you have an HP desktop with windows
Computer Does Not Start Windows 8

Jun 24, 2014 | HP Pavilion PC Desktops

2 Answers

I turned off the computer by going to shut down earlier today I went to turn it back on this evening and the CPU won't turn on

hello, make sure nothing has come unplugged and that none of the buttons are stuck on. With that said if this is an older pc, your power supply inside the case might have went out. power supplies go out quite often, replacing them is not to bad just make sure you have the correct physical and power size. Also verify that it has the connectors for that particular motherboard.
hope this helps

Jan 14, 2011 | HP Pavilion a6650f Desktop PC

1 Answer

Computer won't boot - fan on cpu does not run - cd drive does not power up -


If there is no sign of life, then it is usually a power supply problem. Check PSU connector. If PSU fan does not turn on check the power cable. If power cable is good, test power from PSU using a multimeter and eventually replace PSU.

Dec 03, 2010 | E-Machines eMachines Refurbished EMA...

1 Answer

Hi, my compaq presario sr2032x wont boot. Power light is ON, PSU light is green. CPU fan runs at full speed. I can hear HD sound too. No display. Keyboard light would blink once and then nothing. It was...

Actually it boots, just that you don't see it. Try using another monitor - even a tv will do: disconnect the present monitor, connect the new one and reboot. If you get an image then the monitor is dead, replace it. If you don't then the onboard video card id dead, get a new one and try again. If even now it.s dead then you need a new motherboard.

Sep 10, 2010 | HP Compaq Presario SR2032X PC Desktop

2 Answers

Installed a new e5300 2.6ghz dual core cpu on my hp dc7600 CMT to replace my 3.6ghz HT cpu. Both cpus use a lga775 socket with 800fsb. Once installed computer flashed 9 times on front panel red. checked hp...

check the bios settings...if onboard video is enabled or not....
if this does not solve the problem...try to replace the psu...with a good psu from corsair...
this might your further queries

Dec 18, 2009 | HP Compaq dc7600 Convertible Minitower PC...

2 Answers

My computer continues to shut off I have tried PSU and CPU it still does it between a half an hour to two hours. Any suggestions? I have an HP A310N. With windows XP

Have you checked the temperature of the components?

If the temperature reaches too high of a point, it will automatically shut off, either to preserve the components, or just because it fails.

Make sure that the components you have in are getting enough power from your PSU.

Have you run a memory test? It's unlikely, but that could cause your problems.

If none of this helped, respond, and I'll be sure to help you out further.

Nov 25, 2009 | HP Pavilion a310n PC Desktop

2 Answers

The computer will not power up and there is a flashing green light in the back

Replace power supply..May have juice enough to turn on powersupply fan and maybe cpu fan but not enough amperage to power up system. Go to Best Buy or local Computer shop and replace yourself.

Aug 28, 2009 | HP Presario S3200nx (DC479AR#ABA) PC...

1 Answer

There is no power. The green lcd light is blinking on back. Other then that I can't get the machine to do anything. HELP!

First thing to do is to verify that the pc isn't powering on.

- listen for the hard drive(s) and fans. If you don't hear them, skip these tips.

- open the cd/dvd drive bay. If it opens, you've got power.

Now, since this a vague subject, here's what the possibilities are IF the pc isn't power up:

- PSU (power supply) failure. They can be killed by power surges... frequent power outages from tripped home breakers, lightening strikes and so on. If the PSU fan isn't operating, it's a good sign that either the PSU fuse is dead or the PSU itself is.

- HDD (hard drive) failure. Although, in this case, you would get an error message on the screen informing you that no operating system was found.

- Improperly installed or loose componants. Sometimes the pc will simply shut down and refuse to start if RAM is installed incorrectly. It would also refuse to start up if the RAM were dead (not likely that all RAM would die at the same time though).

- CPU (processor) failure. Overheating caused by insufficient are flow (dead cpu fan or excessive dust) and power surges can cause a cpu to fry. This will cause the pc not to start up.

- Resource conflicts. If you've recently installed a new componant, the pc may not start if that componant conflicts with the resources that another major componant is using. In this case, uninstall the componant that you've installed and restart.

- MB (motherboard) failure. Excessive heat, shock or condensation can cause the micro curcuits of the board to melt, crack or short. In this case, there's nothing you can do but replace the board ( can offer cheap, quality replacements).

Unless you'd care to elaborate further regarding the details of this malfunction, I'm afraid that you'll have to investigate each one of these possible causes to find the issue.

Apr 09, 2009 | HP Pavilion a706n PC Desktop

2 Answers

No power in the pc

It does sound like the power supply. Try flipping the power swich in the back, by the cord, then press the power button on the front again. But most likely, the power supply will need to be replace. If you do happen to get it come back on, take the cover off and verify the CPU fan is spinning, if it's not, that could be the problem as well.

Dec 22, 2008 | Compaq Presario 5000 PC Desktop

Not finding what you are looking for?
PC Desktops Logo

Related Topics:

388 people viewed this question

Ask a Question

Usually answered in minutes!

Top PC Desktops Experts


Level 3 Expert

5660 Answers

Brian Sullivan
Brian Sullivan

Level 3 Expert

27725 Answers


Level 3 Expert

18259 Answers

Are you a PC Desktop Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides