Question about IBM (02R4087) Motherboard

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There is no voltage to the processor

When switch onn the computer the processor fan runs, then suddenly off the fan. what can i do?

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U must chek ur power cable and remove ur ram in slot then start and see what will
fans work or not if its stop then add ram and processor remove and check and remove

Posted on Jul 25, 2009

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2 Answers

Why does my computer fan suddenly run faster


As the cpu (central prossing unit also known as processor) heats up the fan will surge to cool it down. Nothing to worry about. If this helps you rate favorable.

May 12, 2014 | HP TouchSmart Computers & Internet

1 Answer

No lights on AC unit but fan is running.


Possible that the processor has failed and it seems to give a through circuit to the fan which runs when power is switched on.
You can check the voltage on the processor IC and if absent then you must check the DC voltage on the circuit board. If there is no power then it is the failure of the power supply section and if not the processor is the suspect.

Sep 27, 2013 | Fedders Heating & Cooling

1 Answer

Red hard drive light and fan continuously running


Let's diagnose from your statements;

A) No display on monitor

B) Harddrive activity LED is on

C) Fan keeps running. Assume your reference is to the computer case fan. IMHO if it was a reference to the Processor fan, you would have stated so.

D) Power Supply changed. Assumption is that it is KNOWN to be good......

A1) Following a diagnostic flowchart, you would rule out the possibilities of a problem, one by one, and step by step.

No display on the monitor can mean a lot of things, however with the additional information we can narrow it down further....

B1) The Harddrive activity LED is on. The way you made the statement, makes me think you are referring to it is CONSTANTLY on.

Reason?
Harddrive is in an endless loop. BIOS is trying to find the Boot record on the Harddrive.
However for some reason it isn't finding it.

C1) Fan keeps running....
This leads me more to believe the reference is now, to the Processor Fan.
Processor fan running at high speed.

D1) When someone states they 'Changed' the Power Supply, instead of Replaced the Power Supply, this leads me to believe the reference is to another Power Supply that was laying around, and not a new Power Supply.

Therefore makes me want to ask;
"How do you know the Power Supply is indeed good?
All 3 main voltage power rails are good?
3.3 Volt, 5 Volt, and 12 Volt? (DC)"

A Power Supply with a weak voltage power rail, will show the symptoms you are seeing.
Why?

1) If ALL of the LED's (Light Emitting Diode) were on at once, they would use less than 1 Watt of power.

2) EACH fan uses 2 to 3 Watts of power.

3) A typical Processor can use 51 to 130 Watts of power.
Just depends on what Processor it is.

No Processor running, no 'Brain'
No 'Brain' running, no computer.

You press the Power On button. This plastic assembly then presses against a Power On switch, located inside it.

The Soft Power On circuit is activated. This 'excites' the Power Supply, and turns it on.
The first chipset to receive power is the BIOS chipset.
The Basic Input/Output System program is initialized.

BIOS looks to see what devices are connected, does a Ram Memory count, TURNS THE PROCESSOR ON, and hands the computer over to the Operating System.
(In this case the O/S is some version of Windows)

Processor is NOT turning on. No 'brain' operating to find the Boot record on the Harddrive.
Harddrive spins in an endless loop.

Power Supply is KNOWN to be good? Came out of a working computer?
Power Supply is a new one?
Still doesn't mean it is good. Test the 3 main voltage power rails, with a multimeter.

Assuming the Power Supply IS indeed good......

Clean out the inside of the computer.
Replace the Thermal Paste on the Processor (CPU)
Make SURE you are following Anti-Static Procedures.
[The CPU (Processor) is the MOST susceptible hardware component to Static shock ]

However, after replacing the Thermal Paste, do not plug the Power Supply into power.

Press the Power On button in, and hold in for a count of 10 seconds.
Let go.
Do this procedure 2 more times.
What you are doing is clearing CMOS Error Codes, and resetting BIOS Setup back to the factory default settings.
The former matters, not the latter. Just telling you the 'whole story'.

NOW plug the Power Supply into power. WAIT 1 minute, turn the computer on.

Post back in a Comment with the results. Or click on Reply at end of solution, and post results.

Need guidance in replacing the Thermal Paste on the Processor (CPU)?
Post the computer manufacturer name, and model number.
The Model Number can be found on the Back of the computer, or up on the side of the computer tower.

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3071621&CatId=503

http://www.hardwaresecrets.com/article/274

Regards,
joecoolvette

May 14, 2013 | Computers & Internet

1 Answer

No Beep no display: Cpu fan Running.


first shut down you computer remove the covers of the cpu then locate the memory and remove them wipe them clean with clean cloth and switch the computer on with out the memory and see if you hear any beeps if you hear beeps insert the memory and switch on the computer if still no beeps then remove the processor fan and clean the surface of the processor fan and the processor apply a thin layer heatsink solvent and clip the processor fan tighty to the socket

Dec 29, 2010 | ASUS P4VP-MX Motherboard

1 Answer

No display even after the system boots


You either have a dead CPU or a dead motherboard or a partially-dead power-supply -- the power-supply should supply different voltages to different computers, i.e., one voltage to spin fans, and a different voltage to power the RAM, and a different voltage to power the motherboard. So, it can be "partially" dead.

Borrow a power-supply, and try that first.
If all else fails, take the computer to a qualified technician.

May 31, 2010 | AMD Athlon 64 X2 3800+ Dual Core Processor...

1 Answer

My suddenly shutdown then i power on machine must be restart and restart tell me wat the solution


Three main things can cause this.

1) Inside of computer is dirty, as well as the inside of the Power Supply.

Dirt, dust, etc, can cause the cooling components capacity to drop tremendously.
If the Processor overheats, it is turned off. (BIOS turns it off)

This is a Fail Safe feature that is built-in, to keep the Processor from burning up. (Literally)

A non- working Processor fan, or one that works intermittently, or doesn't spin as fast as it's supposed to, will also cause the Processor to overheat.

The major cause of computer failure, is that the computer, (And Power Supply) is dirty inside.

Solution is to have the computer unplugged from power, computer case open, use a can of compressed air for computers, and clean the inside of the computer, PLUS the inside of the Power Supply.

(Read about Anti-Static precautions below, BEFORE you do)

2) Power Supply is bad. Weak voltage power rail, brought about by failing components inside the Power Supply.

Test the Power Supply for voltages.
Computer power supply's, supply three main voltages.
A) 3.3 Volts
B) 5 Volts
C) 12 Volts

[Orange insulated wires are 3.3 Volt.
Red wires are 5 Volt.
Yellow wires are 12 Volt.
ANY Black wire is a Ground wire]

This test can be done with an inexpensive multimeter, or a Power Supply Tester.

The Positive (Red) probe lead of the multimeter, is connected to the power wire to be tested.
The Negative (Black) probe lead is touched to any Ground wire.

The 12 Volt power can be 11 to 13 Volts. Below 11 Volts it's time to replace the Power Supply.

This is one example of an inexpensive, easy to use Power Supply Tester,

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=5250576&CatId=5471

Or, a compatible, KNOWN to be good power supply, can be substituted, and used for a test unit.

3) Electrolytic Capacitors are failing on the motherboard.
Specifically, the ones used in the motherboard Voltage Regulator Circuit.

One of the jobs the Voltage Regulator Circuit does, is to regulate voltage for the Processor.
A Processor must have a Steady, Clean, supply of voltage, and the voltage MUST be kept within a certain range.

This range, or Tolerance Zone, is VERY small.
Too little voltage the Processor turns off.
(No Processor operating, No computer)

Look for obvious signs of capacitor, (Electrolytic Capacitor) failure.

http://www.capacitorlab.com/visible-failures/index.htm

(Takes a couple of seconds before the page fully loads)

This is what happens when Electrolytic Capacitors are failing, in the motherboard Voltage Regulator Circuit,

http://www.youtube.com/watch?v=KN6_-8fYHo0

(Starts at 0:04)

Solution is to replace failing, or failed Electrolytic Capacitors, or replace the motherboard.

To summarize:

1) Check to see if the computer is dirty. If so, unplug from power, open the computer case, use a can, or two of compressed air for computers.

2) Visually inspect for bad capacitors.
(BEFORE reaching inside a computer, have the computer unplugged from power. Observe Anti-Static precautions.

Your body carries Static electricity.
Static WILL fry out {Short Circuit} the hardware components inside a computer.

Work on a table. Computer Unplugged from power. Computer case open, TOUCH the metal frame to relieve your body of Static.

SHOULD you get up, walk away, then return, TOUCH the metal frame again)

3) Test the voltages of the power supply, or use a KNOWN to be good, compatible power supply for a test.

NOTE*
The Power Supply may light lights, and spin fans. It may even sound as though the Harddrive is running.
However if the Power Supply has a weak voltage power rail, there won't be enough power to turn the Processor on.

A) All the lights use less than 1 Watt of power.
B) EACH fan uses 2 to 3 Watts.

C) A typical Processor can use anywhere from 51 to 125 Watts. Depends on what Processor it is.

No Processor operating, the Harddrive just sits there, and spins the Platters inside.

There is no Processor to find the boot sector located on the Harddrive.
That's why it sounds like the Harddrive is operating, but in reality it isn't.

Read this to know how a Harddrive is made up, and about the Platters I referenced to above,

http://computer.howstuffworks.com/hard-disk.htm

May 21, 2010 | Computers & Internet

1 Answer

While running the computer all of sudden switched off


If your PC SMPS is ok then your PC motherboard has been faulty. pls checked it from service center.

Oct 13, 2009 | ASUS P5GD2 Deluxe Motherboard

2 Answers

M2N MB LED is on, fan comes on for 2 seconds only


It's a bad power supply. Couldn't be a bad Power On switch, because it turns on for 2 seconds.

You have to have Ram to get the computer to function, besides the processor. All you will see is the BIOS Setup screen.

Been using the same power supply?

The power supply has bad Electrolytic Capacitors in it. These bad 'Caps' in turn make a weak voltage rail. You have three main voltage rails inside a computer power supply.
The 3.3 volt rail, the 5 volt rail, and the 12 volt rail.

With a weak voltage rail, the processor won't have enough power to run.
ALL the lights, (Lamps), use less than 1 Watt.
EACH fan uses 2 to 3 Watts.
Processors use 55 watts to 125 Watts. Depends on the processor.

Jul 25, 2009 | ASUS M2N-E SLI (M2N-E SLI GREEN)...

2 Answers

My computer goes off suddenly.


replace your power supply then check

Nov 20, 2008 | Computers & Internet

1 Answer

Processor


You either have poor cooling from a bad cooler fan, dirty heat sink or dry thermal paste or too much voltage supplied to the processor. Try to clean the dust from your computer inside. Make sure a cable or other object is not preventing the processor fan from turning.Find you processor's voltage and go into the bios and make sure it is set for that voltage.If not set it to that voltage.Let me kow how you make out.

Sep 24, 2008 | Computers & Internet

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