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How old is the computer? Make sure that the power light comes onto the monitor when you plug it in, should be orange and then turn green when video card syncs with it when PC is turned on. If you are getting black screen when PC is powered on:
1. Bad video card
2. Bad video cable
3. Bad monitor
1Solution: Try using a different monitor attached to this same PC and see if it works. If it does, then its the monitor, its cable, or its power supply. If it doesn't work, then its the video card or the video cable coming from monitor.
You mention that a switch is broken? I am assuming that you mean the power switch for the monitor? If so, then you can probably get the manufacturer and model, look it up on the web and order a new knob or switch from manufacturer. If this is not an option, then you will probably have to take the monitor apart to see what part of your substitute button is not touching, b/c what a button does it activate a special area on a circuit board that connects or disconnects power to its specificed area (where the button is sitting)