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Check you video card first, if you can remove it, then have it clean, the contact with an pencil eraser, just make it sure wipe the eraser residue, then put it back again, also check the built in fan on your video card, make it sure it is running
It's a bad back light inverter. These models are NOTORIOUS for them. It's a simple fix for a technician and not very expensive. I fixed mine about 2 years ago and it's still going strong.
You can purchase replacement inverters and if you're handy with a screwdriver you can fix it yourself.
-=/ Daft Tech /=-
Your power-inverter board needs an overhaul.
Probably in need of the standard capacitor replacement.
a bulb in the screen is bad (a bad bulb will usually show symptoms)
It will flicker, or will look pinkishish for a bit or dark in the middle top or bottom of the screen.
Unless there is inadequate ventilation, your monitor could remain on all the time with little ill effect. Actually turning on and off your monitor actually puts more strain on it then leaving it on all the time.
If the gateway screen is displayed for a moment and then just turns off, I believe the inverter board inside the monitor has broken. What's actually happening is that somewhere in the board more voltage then needed is "leaking" in and the safeguards on the board turn it off to prevent damage.
I would go and get an estimate from a shop. If the price is within 30-50 dollars of a new monitor, get a new one.
It's almost certainly a bad connection inside where the mylar strips attach to the LCD.
If this is under warranty, you should contact Gateway.
If it's out of warranty, it's not economical to repair this problem.
It would require a whole new LCD panel, and - believe it or not - that part's cost usually exceeds the price of the monitor!