Computer is turned on , but no screen signal.what to do?

Answer It's not a virus effect .It's a problem with your Display adapter .Beep code that you hear must be like 1 long and 2 short that indicates that it's Display adapter problem (MDA, CGA)

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My computer screen has turned sideways. how do i fix it?

press ctrl , alt, and the up and down keys ( arrows) at the same time

My computer screen has turned 90 degrees counter clockwise?

Yes really, let this be your lesson learn to respect family. :P

My computer screen turned counter-clockwise. What do I do?

Push the CTRL and ALT keys and hold them down. Push the up arrow and release all keys. This should fix it.

My computer screen shows up upside down when it's turned on how can i fix?