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Monitor says no signal

When i turn monitor on it comes on then it says no signal

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No Signal = No video signal.
The monitor isn't receiving a video signal from the computer.

1) If your monitor has a detachable monitor cable, try another monitor cable, if available.

2) Computer off, unplug your computer from power.

Suggest you detach all cables going to the computer.

(If you are not perfectly sure where all the cables go, suggest you make yourself a drawing, and notes before you detach the cables)

Lay a towel on a table, and lay the computer on it's side, Side Panel up, that removes.
Remove the Side Panel.

Follow Anti-Static Precautions before you reach inside the computer.
Remove all ram memory module/s.

Use a can of compressed air for computers, and clean the inside of the computer out, as well as the inside of the Power Supply.

For areas that are built-up with thick 'gunk', you may want to use Q-tips to break the 'crust', then follow with the can of air.

('Gunk' = Dust, dirt, hair, dead bugs, etc.)

It may take more than 1 can of air.
There is a plastic 'straw' provided with the can of air. Insert it into the can of air's nozzle.
Use the can of air as a painter would use a paint gun.

Start at the inside top corner of one side, go across to the top corner of the other side.
Press the trigger of the can of air in all the way as you start, let go of the trigger as you reach the other side.

Drop down a space, go across again. Spacing is up to you, as to how far you drop down.
Generally 1 to 2 inches is what I use.

Keep going across in rows, and dropping down, until you reach the bottom of the computer case.
Tip the computer case top towards you, then use the air to remove all the 'gunk' at the bottom of the computer case.

Pay special attention to the Processor fan, and the Heatsink under the fan.

You may find that using Q-tips on the fan's blades, center hub, and surrounding shroud, will help break the 'crust' loose, so the can of air can remove this 'gunk'.

The fins of the Heatsink need to be clean as possible.
When using the can of air on the Processor fan, try to use Short Bursts of air.
Squeeze the trigger in all the way, then let go.

You do Not want to spin the fan faster than it was designed for, as this can lead to premature failure of the fan's bearings.
Short bursts, Q-tips.

Make sure the computer case fans are clean, also.
Use the plastic straw, to insert part way into a ventilation hole of the Power Supply's case. (Inside the computer)
Start at the top, work your way down.

Hold onto the plastic straw when inserted into a ventilation hole, with one hand, use the other hand to hold the can of air.
The plastic straw can shoot off, and wind up inside the Power Supply, if you don't.

The 'gunk' will be moved towards the back of the Power Supply, where the fan is.
Make sure the Power Supply fan blades, center hub, and surrounding cage are clean.
Again, Q-tips can help before using the can of air.

One more time inside the computer case, towards the bottom.

Make sure you use the air on the ram memory slots.
Now clean the gold plated contact pins on each ram memory module.
(Module = 'Stick'. Ram memory module = ram memory stick)

Use a pencil eraser to clean the contact pins.
If you are not using a solid eraser, and are using an eraser on the end of a pencil, refrain from letting the metal near the eraser touch the contact pins.

Hold the ram memory module by the body.

(The body of the ram memory module is where the black rectangular objects are. The body is coated with a see-through protective plastic.
{The black rectangular objects are DRAM chips)

This example is a close-up view of a typical ram memory module. It is DDR Sdram ram memory. (At 266MHz, or also stated as PC2100)
(Has 184 contact pins. 92 on each side)

Here you can see the DRAM chips I have referenced to, and the gold plated contact pins. (You can enlarge the photo by left-clicking on it)

Rub the eraser on the contact pins. Side to side motion, and/or up and down.
The contact pins can develop corrosion after time.
Corrosion on the contact pins = bad contact.

The corrosion isn't all that readily visible to the untrained eye.
After you have cleaned a few of the contact pins, you may notice they are a bit brighter, than the one's that haven't been cleaned yet.

Use air to remove the eraser dust.
You can use air from a can of compressed air for computers, or air pressure from your mouth will be sufficient.

Reinstall the ram memory module/s.

Close the computer case, sit the computer back into it's normal position, reinstall all cables.

Computer still unplugged from power, press the Power On button in, and hold it in.
Hold the Power On button in for a full count of 5 seconds.
Let go of the Power On button.
Do this procedure TWO more times.

What you are doing is clearing CMOS Error Codes, and resetting BIOS back to the factory default settings.

Now plug the computer back into power.
WAIT 1 minute, turn the computer on.

If this does not solve the problem, we will diagnose the Power Supply next.
State in a Comment, if the above does not solve your problem.

Should you need guidance in opening your computer, and removing/reinstalling the ram memory module/s, please state so in a Comment.
State what Model Number of eMachines you have.

Anti-Static Precautions:
Your body carries Static electricity.
Static WILL fry out (Short Circuit) the hardware components, inside a computer.
You may not even see it, or feel it.

Computer unplugged from power, computer case open. (On a table), TOUCH the metal frame of the open computer case.
This action alone will relieve your body of Static.

If you get up, and walk away from your computer in the middle of working on it, upon your return be SURE to touch the metal frame again.

A better method is to use an ESD wrist strap, and connect the alligator clip to the metal frame of the open computer.
(Electro Static Discharge)

An example of an ESD wrist strap,

Posted on Jul 20, 2010


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