HiMy LCD monitor is 5 years old and goes on and off. So it would be normal then flashes the black screen then goes back to normal. It would turn black after 5 secs.
Perhaps the age has caused a wire in the signal cable to eventually be loose. If the monitor is able to have the cable removed and you have another, see if switching and using the other cable helps.
Your lcd is having trouble with what are called display guns and or capacitor that also has a Resitor that controlls the direct current to both your question is short with no detail so i can only give you my edgucated guess . I hope this helps After five years though its probly best you invest in a new one. From experience lcd, plasma do not hve a long life. Their not like the old tubes! I cnat go into detail. sorry no time.
Check the power cable of your monitor. If everything appears normal, you may need to get a new monitor.
