When I power up my PC and switch the monitor on - all is fine in terms of lights etc. but the monitor screen is totally black (but green power light on as usual). Only when I turn the monitor off then on again do I get a picture.
I haven't enabled power-saving/energy modes and can't for the life of me work out what's wrong.
Only suggestion I have is whilst it is 'totally black' press 'prt scr'. When you then have a picture, open Paint (or similar) and Edit/Paste. If a picture of the screen is produced, then at least you know the graphics card is OK.
Then you will have to check all cables and connections. It could be a failing power switch.