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1) Ensure that the power adaptor is the correct polarity. Ideally you should use a Casio power supply rather than a generic one. For Casio the centre pin must be - Negative. Many power supplies have + as the centre pin, this is therefore like connecting the batteries up backward - IT MAY DAMAGE YOU KEYBOARD
2) The socket on the keyboard where the adaptor plugs in is prone to breaking and coming loose from the circuit board Looks something like picture below ( maybe grey ) This can often be diagnosed by holding the power adaptor plug where you clip it into the keyboard and moving it at the same time as turning on. If you get any lights the socket is faulty and will heed to be replaced. If you post the model number I can advise on socket needed.
3) More serious internal damage possibly as a use of wrong power supply ( see note 1 )
1. Unplug the power supply from the wall outlet.
2. Unplug the power supply from the back of the printer.
3. Wait at least 20 seconds, then plug in the supply back into the wall outlet.
4. Plug in the power supply back into the printer.
5. Press the power button to turn the printer on.
Hard drive issue or power supply. Power supply prone to bad capacitors (look for leakage/swollen tops)
If hard drive faulty you'll need a new one which is no small task. Disk contains firmware and custom file system and smallest I've got image is 10.7gig
Have you checked the fuse? If the fuse is good you have a problem with the power supply which can be repaired. You would need a service manual for the power supply. But that would be a lot cheaper than having it repaired by a shop. Power supply problems usually run about 400 to 600 in a repair shop. When often it is a 20.00 part. If I can assist you further please let me know.
No there's just one 12v positive and a negative on the white plug, these units were prone to dry joints on the power supply board so if you strip the unit down and unscrew the power supply board which is screwed to the chasis and look around the white plug connector and also the bus lead connector beside it, you may find that it needs resoldering, hope this helps you!
You seem to have an oddball monitor if what you describe is correct.
The power supply to a monitor[Display Screen is that what you mean?] is either direct to main power- in which case the power cord is either built in with a power plug for wall socket,
or has a socket on the back for a separate main power cord.
Or is powered from a low voltage converter that delivers low volts usually via a coaxial plug like this illustration
PS2 connection does dot come into the equation as far as I know unless you have got hold of something unusual.
Tell you what take a shot of the back of the monitor and lets have a look see mean while here's is a shot of a typical low voltage power supply available anywhere.