Question about Dell (S423) for Dimension 8100 (3F546) Motherboard

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Loud whirring noise when mains switched on but PC still off

When I switch the mains power on for my Dell 92000 system, the fans appear to start and they seem REALLY loud. That's it. There's nothing on the monitor, and the monitor light is in fact still orange (as it would be if the monitor was on but the PC switched off).

Sometimes, the fans seem to be getting faster and faster, and I switch the thing back off when it starts to sound like a plane starting up.

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Re: Loud whirring noise when mains switched on but PC...

Most likely worn bearings in the fans.

If that's the case, replace the fan/s.

Posted on Jan 23, 2008

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Does the power supply fan spin up? does the cpu fan spin up? do any of the lights work? does the machine make a beeping noise? Is it plugged into the mains and switched on? is the monitor plugged in and switched on?

Jun 24, 2012 | Matsonic MS9367E Motherboard

1 Answer

I have a HPDV9000 Laptop and it is making a terrible loud noice, very annoying. Starts when turned on. What can it be. Thank you.

More than likely it's one of the cooling fans. They spin at relatively high RPM and if they're damaged they can emit a loud whirring or screeching noise. If it's a clicking noise then it could be your hard drive failing.

May 04, 2011 | Motherboards

1 Answer

Please i need your help dell optiplex gx 280 there is a very loud noise when i press the power button and the power button colour is red instead of green nothing appears on the screen

check the boards compasstors if they have a round top on them or not if they do you need new board check also the power supply as well jim look at fan on cpu if it turns or not

Apr 04, 2011 | Dell Optiplex GX280 (99301) Motherboard

1 Answer

Motherboard won't boot: no noise, no nothing...

Shorting the two leads will work but don't keep the two wires together. They are not ment to stay connected. Consider replacing your cases ATX power switch. Take a look at the link provided for a new switch;

The green LED on the motherboard means the board is in "Stand by mode". This green LED uses 5V DC to light the LED. After replacing your PS back into your system it may function just fine.

Good luck.

Dec 03, 2009 | Intel Motherboard

2 Answers

I had a loud fan noise coming from inside my desktop box for a while. One day (& ever since,) when I went to turn the box on, absolutely nothing happened: no fans, no BIOS, no LEDs. I made no config...

This may work however i think by ignoring the sound of the Fan you might have destroyed the cpu and the motherboard.If you can try the processor in another machine you might just have to replace the motherboard only.
Good Luck

Dec 03, 2009 | Intel Motherboard

1 Answer

PC won't start up

Hi There,

I would suggest you test it with another Power Supply, or check you Ram, Let me know if successfull or not?



May 27, 2009 | Dell Computer Refurbished OPTIPLEX SX270...

3 Answers

PC start directly

Explain what you mean when you say 'when i open the pc from main switch'.
Also, something you should try is updating the CMOS, or in other words flashing the BIOS firmware. Go to your motherboards manufacturers website and see if there are any BIOS updates for it.

Mar 03, 2009 | Intel PENTIUM-4 865GV CHIP MOTHER BOARD...

2 Answers

Faint noise on booting.

Try this remove side cover and boot computer listen for any extra noise fan etc. also by power supply
As I think you have a bad bearing in a fan
To temp fix it
remove paper cover over center of fan and put a small and I mean small drop of light machine oil on bearing then replace paper cover.
check if this stops the noise if it does you know which fan to replace.
If it is power supply fan and if you think yourself capable remove fan and do the same to it

Oct 13, 2008 | Intel Motherboard

1 Answer

Loud fan sound

You have a "No POST" situation. Check the power button, more than likely it is not a solid green.

Your computer is probably old enough to have lifetime troubleshooting support from Dell, if you are the registered owner. They won't replace any parts (but they should help you figure out exactly what _is_ wrong).

I will say that unless you are prepared to do the work yourself, repairing the system will cost nearly as much as buying a new (and much faster) computer. With the economy the way it is, there are some great deals to be had. You'll only need a box, so check out outlets like

Sep 26, 2008 | Dell (S423) for Dimension 8100 (3F546)...

1 Answer

Dell motherboard {GX 270} over heating.


It seems the system is "dying" or already "dead". The initial heat issues suggests a faulty Processor (PRC) Fan. Faulty Power Supply Unit (PSU) Fan can have same effect.

Open the Base unit; disconnect everything (incluiding Keyboard, mouse, network) power-up and check that PRC and PSU fans are working.

Also check the QUAD Pack Diagnostic LEDs and compare the sequence with

This will help with identifying the cause. Try the Dell Suggested Resolution.
Reply if further help is needed


Mar 30, 2008 | Dell (4T274-DE) Motherboard

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