I have fitted new speakers and checked the connections which appear to be correct if the colour coding is anything to go by, and the monitor shows the speakers running but no sound.

Your lcd screen is going bad. It's either the lcd screen or the video card inside the computer. To isolate the problem try connecting another monitor to the computer. Borrow a monitor from a neighbor, friend, relative or co-worker and connect it to the computer. If the Borrowed monitor displays ok then your video card is ok, but your original monitor is bad. If the Borrowed monitor displays the same as your original monitor then your video card is bad.

Plug in an external monitor and see if the display shows up on it. It can be any kind of monitor even the old big fat crt monitors as long as it has a vga cable to connect to your computer's vga port. If the video shows on the external monitor that proves your video card is ok, ,but your lcd screen is bad. The video will show on most systems when you reboot without you having to do anything. Some systems will require you to hit the FN (Function key) + F1 thru F12. Hold down the FN key then hit the correct key for displaying on the monitor (F1 thru F12). The correct key will normally have CRT/LCD on it or it will have the icon of a display.

right iam trying to re size a picture of the colours and iam posting it as a picture ,if it works

Seems to me that the LCD cables are not properly atached.
Double check all the LCD connections.
Your problem will be solved.

Check that you are fitting the connectors into the subwoofer correctly.
Each plug is keyed (the plug is shaped so that it will only fit into the correct socket).
It is very easy to think you have plugged them in when in reality they are just 'located' in the holes.

hello sir your vertical or horizal IC damaged.......... thats why its showing multi colour ...... just do one thing sir.......... fit your new IC 

if your problem not solved..... type in comment

The blue is for a audio in and pink is the mic. Green is the audio out.
You will need to buy a new video card that has all 4-5 colors (green,,black,orange,blue,pink,white)
That way you can plug in all your connections and it'll work correctly.

1. Speakers working volteage 6V , 9V, 12V. you do onething give me the 5V ,from system SMPS ( black & red colour wires ) you should maintain the polarites. black wire is negative, red wire is positive.its working fine , then give me the 12V from SMPS. ( black & yellow wires )


if u dont maind u have any electronics knowledge. otherwise u should used adopter. there is any problem please give me the mail

this is prob because of a wrong connection between speakers connections + to + - to - check all speaker wires are correct with no shorting out between + & -

Steve

1)check the power supply
2)write in a desktop<properties<settings
3)setting<control pannel<display,appearance