It sounds like the resolution your computer is set for is incompatible with your monitor and/or video hardware. Since you can boot to Safe Mode OK, go into the Display applet of the Control Panel and lower the resolution.
Vista sp 2 64 bit
Hp pavilion elite m9250f
Monitor - hp w1907
It was fine last night but when I tried to turn it on today the monitor blacks out but the comps tower is lit to show its still on.
Restarted in safe mode with networking and it started fine
I'm currently backing my 2 hard drives up with power2go to be on the safe side, but i'd like to know how to fix it as I'm scared to turn the thing off now
Please let me know what you think