|A PC can be a desktop computer or a laptop computer - which do you have? |
Blank can be all white or all black - which is it?
Is it blank at all times, or blank only after Windows (or whatever operating system) is supposed to load?
What's clour? - Do you mean colour?
If this is a laptop, see this - try plugging in an external monitor
Laptop no video, and battery, AC adapter, power jack T shooting.
See response 1:
Some laptops will display on an external monitor without you having to do anything.
Some laptops require that you must press certain keys to toggle built in display / external display / sometimes both displays - see the Owner's or User's manual for the model.