ViewSonic E40 goes blank ,but when tilted or whacked comes back up

My monitor ViewSonic E40 went blank but the LED was still blinking ,so
I did some search looked up some schematics and came up with the
conclusion that a device called NE555 timer or MOSFET is not
functioning properly.The strange thing about the monitor is that when
tilted a bit or when whacked ,the picture comes back.I used to whack a
bit ,to bring up the computer when one day it simply stopped working
.So however hard I whacked there was no picture.Then I tilted the
computer at various angles and learnt that that is another solution to
no picture problem.Let me see if I can get hand on the timer now.