No signal input display

April 8, 2009 at 07:35:46
Specs: Microsoft Windows XP Professional, 2.199 GHz / 2046 MB
my friend got some old computer that she wants to use , usually i do all the repairs but just minor things but now we keep getting that " no signal input " in the monitor everytime we boot up the cpu..

that pc uses its built in video card , and its specs is around Pentium 3 i guess.. she did say she's using it then after awhile the screen turn black then she restarted the pc then from there the screen never turn up and we keep getting that no signal messege from the monitor..

we tried testing it in my LCD monitor but still we get the same result.. im not sure what to say to her... is it because of overheated motherboard? or something else? do we need to change motherboard and processor or just try if we can use a seperate video card? we really need some advice thanks in advance..

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April 8, 2009 at 07:58:32
Try another video card; disabling the onboard


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April 8, 2009 at 08:19:28
No video is usually merely a symptom and there's nothing actually wrong with the video adapter.
If it were the video adapter, it wouldn't work sometimes, not work other times - once it stopped working it would never work again.

"..that pc uses its built in video card .."

If it's built in it's a video adapter, a.ka. onboard video, or a graphics adapter, BUT IT'S NOT A CARD.

The mboard and cpu are usually the least likely things to fail.
It's almost something else that is the problem.

This, or the cpu overheating, are the most common causes of problems like you describe:

Failing power supplies are common and can cause your symptoms.
Check your PS.
See response 4 in this:

- There may be a poor connection inside your case somewhere.

Unplug the case/power supply.
Power off your monitor.
Open up the case by removing the left panel as seen when you're looking at the front of the case.
Check all the connections of the wiring to make sure they are all the way onto their pins and into their sockets, especially the main connector from the power supply. The wires close to the mboard going into the main power connector/socket should be more or less perpendicular to the mboard surface rather than at an angle. Make sure all cards in slots are all the way down in their slots.

Some Dell cases have a latch you must push one way rather than screws you must remove at the back of the case.

It is extremely rare for ram that worked fine in the same mboard previously to go bad, but it can develop a poor connection in it's slot(s).

See response 2 in this - try cleaning the contacts on the ram modules, and making sure the modules are properly seated:


The cpu may be overheating because of accumlated crap on the cpu fan and heatsink.

While you're in there, if the cpu fan/heatsink has mung (dust, lint, etc.) on it, clean it off, but DO NOT use a vaccuum cleaner to do that (they produce a tremendous amount of static electricity when running, and anything connected to them can discharge that to your components) - use canned air, or an air nozzle if you have access to an air compressor, or an artist's brush that can be used in small spaces, etc. It may be difficult to clean the top of the heatsink under the cpu fan - the most likely place to have mung on it - and the bottom side of the cpu fan blades unless you remove the fan. If you have a case fan, clean that too if it needs it.

With the cover still off, restore the AC power and make sure the cpu fan spins - if it doesn't, don't use the computer until you replace it!
If the cpu fan makes a screeching or rattling or rumbling noise, most likely to be noticed when the computer is first started up after having cooled to room temp and having sat that way for at least a few hours, the bearings in thecpu fan are failing and it'slikely the fan can no longer spin at it's full speed - replace the fan as soon as you can

This is possible but relatively rare.

Examine the mboard to see if you have bad capacitors, and/or other findable signs of mboard damage .

This was the original bad capacitor problem - has some example pictures.
History of why the exploding capacitors and which mboard makers were affected:

What to look for, mboard symptoms, example pictures:
Home page that site
- what the problem is caused by
- he says there are STILL bad capacitors on more recent mboards.

Pictures of blown capacitors, other components, power supplies, Athlon cpu's, etc.:

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April 8, 2009 at 08:31:49
EDITED ~ reviewing the above post (^__^) still accepting comments about my problem and thanks for those who already gave their thoughts.

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April 8, 2009 at 08:59:47
thanks tube sand wires and jenn.

no AVR or UPS or something ( she plug it in directly in the walls lol )
we can't hear the beep sounds in booting up the pc!

were currently looking at the cpu for now were trying to look for burned things around the board..

another thing she said she never even once cleaned the insides of this pc for 4 years.. i place my fingers around surprisingly i did leave a mark.. and the dust inside.. gathered it and guess what i can already grab and throw it.. this makes me even want to say to her go burn your board and buy a new one...

will buying a new board and processor be a good choice? considering your opinions and other matters like the board itself is old and also the fan sucks.. i dont know how it keeps spinning despite the volume of the dust..

oh and also the monitor still shows no input signal

hope you keep track on this for now thanks a lot..

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April 8, 2009 at 11:00:11
"we can't hear the beep sounds in booting up the pc!"

In that case the most likely thing is the power supply has failed.

Clean the cpu fan and heatsink!

"will buying a new board and processor be a good choice? "

It's likely there's nothing wrong with either of the present ones, unless the mboard does have bad capacitors, or the cpu fan isn't spinning at all.

If you bought a new mboard and cpu , you might also need to buy different ram, and a power supply with more capacity.

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