Common problems for a black sceen of a LCD type monitor is failure of the inverter that drives the thin flourescent back lights.
Take a bright light and shine into the screen to see if you can see any image there, albeit faint. If you can, the inverter is probably bad. The Inverter is replaced as a unit and is usually right below the screen inside the monitor on a narrow circuit board with a small transformer and a few other components. It generates about 1200 volts to power the flourescent backlights which are tiny long glass tubes.
Other possibilities include failure of the video signals. Try another monitor to verify the signals are good.
I am glad you found the problem... The typical three wire cords do have a habit of getting pulled sideways... ALWAYS check power cords first thing... usually there is an indicator light showing power is getting to the unit... if that isn't there, check the power cord first... Now some monitors have seperate power supplies and the little coaxial power connectors ALSO like to come undone. SOME monitors have a little plastic tooth sticking out to tuck the cord from these under to reduce the chance of them coming loose.
We usually don't tell people to check power cords as some are really offended that we would suggest that... It used to be VERY common for TV service people to find the cord unplugged on service calls...
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Hi the first thing you should do is switch it all off at the mains then unplug the monitor from the back of the computer and unplug it from the back off the monitor, then plug it all back in making sure its pushed in far enough at both ends if the monitor end dont come out of the monitor then just give the wires a wiggle.
then plug it all back in and switch it on, doing the above will remove any static that has built up which could be causing you problems.
if after doing the above it still dont work then have a check in the back of your computer to see if you have another socket for the monitor some pc's have 2 one thats high up on the back of the computer and one lower down where the slots are, you may be using a video card which is lower down the back of the computer if not then you will only have one socket.
if you have 2 try the higher one as this is the computers main socket for monitor and if this works then you know the video card is no good in the computer how ever you can still use it using this other socket.
if you only have one socket or you have 2 and it still dont work then this points to the fact that the video board in the monitor has packed up and would need replacing, the problem with this is that the cost would be more than it would to replace the monitor so its not worth doing.
have you tried bashing the side of the monitor doing this will get it working if the problem is with a solder joint going dry or cracked which does happen over time.
let me know how you get on ok
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Thank you, in trying different monitor, I found that the power cord had slipped slightly and there was no power connection. Works fine now!
problem solved thanks to quick and helpful response
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