Ok so I have set my laptop up and connected a spare monitor I had.
HP ProbooK 6555B
HP w1907v Wide LCD Monitor
VGA Cable connection no adaptors.
This has been working fine for months no problems. Today I turn on my laptop and monitor and the screen is blank.
I've not changed any setting and I can see the monitor is on but just black screen. Screen resolution for both laptop and monitor are on recommended settings which are different from one another.
Read various posts but I can seem to find a fix.