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This sounds like the power capacitors are failing, which is not uncommon for a monitor of this age. You can take it to a TV repairman and get the offending capacitors replaced, however, the cost of replacement may outweigh the cost of a second hand monitor
this works for Dell monitors with a similar problem: shut down, turn off monitor and pc, turn off at wall socket, and remove power plugs from wall socket. wait about 30 seconds. plug back in, turn on, and all should be well? I have used this 3 times on a Dell PC with a Viewsonic monitor.
3 ideas here. bad connections on the coils inside. the inverter board has gone bad, or bad capacitors on the power board or inverter board. all of witch should be serviced by a qualified service center.
IT IS TIME TO BUY A NEW MONITOR. I KNOW ALOT OF OF US CANNOT AFFORD A NEW MONITOR EVERY TIME ONE BRAKES, I HAVE FOUND THAT SECOND HAND STORES SALE THERE MINITORS FROM 1-2 DOLLARS PER INCH, I PICKED UP IBM FLAT SCREEN 20" AROUND 20.00 USD. AND IT STILL RUNNING AND I HAVE HAD IT FOR A YEAR OR MORE NOW.
I got this from the website at Dell. It looks like the cord you want is the second one. I'm basing this on the fact that normal operating wattage is 55w with a max of 74w and that would describe your second cord. The first one wold provide too much power.
VESA Modes Horizontal Sync Vertical Sync Video Power Indicator Power Consumption
74 W (maximum)* 55 W (normal)**
Less than 3 W
Less than 1 W(at 110 Va)