Question about PC Chips : PC-Chips M909G P4 /FSB 533/DDR333/A&V&L/MATX Motherboard

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Power on but no display processor fan running power switch light off

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Power light possible means nothing, maybe a burned out led.
No display: Try feeling the cpu heatsink to see if its getting warm. If it is cold after 15 minutes running, the CPU may have failed. If warm, move onto the graphics. If using onboard, try using an aGP card and see if you get a display then.

(I'm assuming that you get a beep on powering up? If you get no beeps at all, confirms CPU is at fault, if 8 beeps on start up, probably graphics. any other beep codes, post them and I (or somebody else will help)

Posted on Dec 29, 2010

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Hi !
When I swithch on my computer's power supply the cpu fan is running without pushing the cabinet power "ON" switch, and the computer is not working, and also motherboard led light is not blowing. Please guide me with your great exprience.
Awaiting for your good reply as early as possible.
Thanking you.

Posted on Mar 28, 2011

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One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect your hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your motherboard to your hard drive make sure they have a secure connection and are not faulty or just replace them there probably old and faulty

hope this helps

Posted on Dec 29, 2010

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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.

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.

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.


May 14, 2013 | Computers & Internet

1 Answer

I have a NNSD297 Panasonic over the range microwave oven. First the unit had power, clock , timer, fan was working; except after hit the start button, maybe 2 secs looked like working then stops operating....

Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if the switch contact are not good then it will not trigger the processor to switch on the waveguides. If the lights or fan work without any display or action of program being triggered to start then it can be a possible fault on the main board or the processor. Sometimes insect secretion can short the board and display panel and so the processor can work in such an erratic manner. If so clean, solder and reset the board. Now identify the parts by clicking this link:

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron. Check this link to know how a microwave works:

Feb 11, 2013 | Panasonic Microwave Ovens

1 Answer

No display in monitor when i switch on my pc, i can see display on monitor after switching on the cpu for 5 or 6 times

Hello sir, hi, check out the following: I'm assuming the things that you may have forgotten.
1. is the 4 pin 12V Molex power connector connected to the mother board? 2. did you use a a good and tested memory module? have this module tested first on another PC. 3. Is your memory slot free of dust and dirt? if not clean it up. 4. is you power supply fan and processor fan spins when power is on? 5. Try powering ONLY the motherboard connected to a video display, no sata/ide cable with a tested memory installed. 6. try another Power Supply box. 7. Is your processor mounted properly? 8. when you apply power look at the keyboard lights, 3 lights initial power on then 1 light the numlock led is on. 9. do you have a plugged in usb device, remove this device as you power on the motherboard. 10. do every thing again and double check.
if all else failed, bad mother board. have this checked by a technician.

Oct 18, 2010 | Gigabyte GA-945GCMX-S2 Motherboard

1 Answer

Intel mother board power light is on... but processor not working.. when switch on my cpu. the mother board powerlight displayed.mother fan is only one time run for sec.. processor not on

This is was with me too. I know how to fix it. Remove all cables from your cabinet, i mean like keyboard, mouse, moniter etc. Remove your ram too. Then press your power button from 30 seconds. wait for 10 mins plugin all cables and turn it on. Hope it works for you.

Best of luck.

Jul 22, 2010 | Intel D945GCCR Motherboard

2 Answers

It makes three beeps and the fan will be running and the power light will be on no screen display when you leave it running and switch off and on it works fine

check out your memory ram, try to replace it and switch on again,..also check your cmos battery, if it is low, then replace a new one....last options are to check and change the processors..try it

Oct 28, 2009 | Computers & Internet

2 Answers

Switch on problem no processor running

845gvsr no display given ram beep but ram ;ram ic and bios is ok what can i do sir

Jul 27, 2009 | Intel D845GVSR Motherboard

1 Answer

Mother board no display

Looks like the lights are on? Fans spin? Sounds like the harddrives spinning? The power supply is bad. has just enough power to light lights, and spin fans, but not enough for the processor. (No beep sounds, because BIOS hasn't done a memory count. It's not going to)

ALL the lights use less than 1 Watt.
EACH fan uses 2 to 3 Watts.
The harddrive just sitting there spinning, uses about 5 watts.

Processors use 55 Watts to 125 Watts. Depends on the processor.
Not enough power to turn the processor on, the computer won't work. Computer isn't working there isn't anything to turn the monitor on. No Signal.

Apr 17, 2009 | Intel Motherboard

2 Answers

No display cpu fan are'nt running though there is green and orange light on server

Hello there,

Check your power supply and see if its functioning.

CPU fan that does not run means there is no power getting into the motherboard.

Thank you for using Fixya

Apr 06, 2009 | Fujitsu Siemens PRIMERGY P200 Server

1 Answer

When cpu switch on processor & power supply fan runs, no display

if you have swolen capacitors you are on the road the failure

buy a new mb and save yourself some time.

hope this helps

Dec 30, 2008 | EliteGroup P4IBMS Motherboard

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