The monitor (Gateway FPD1975W) turns itself off after a couple of seconds. I have tried rebooting a number of times - same problem. When I turn the monitor off and then on again it works for a second or two, then goes blank again. Just prior to this problem it was working OK, but not as bright as before. I am now using an old NEC monitor, and that works fine.

If you try the monitor elsewhere and still does that, there are chances that the hight voltage work for few seconde then stop.

Most monitor experience this with age, I use to open the monitor and look for condenser that have the top carved, not flat anymore.

this mean that the condenser dry and made internal gaz.
Those should be all replaced. 2 time over 3 it does fix this issue.

then if you try you monitor on a computer and it does work correctly, then it would be the PS3 , I suggest trying to unplug the PS3 for a 30 sec then try rebooting it. (did happend to me once)

The power supply may have finally died, I would inspect it for bad DC filter caps with leaking/bulging top/bottm seals first, then check for cold solder joints, burnt parts.
Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Please post back what you find.

With the pixels acting up and the monitor having the same problem on any computer that its connected to. The screen itself is bad and since there are no replacement screens for that monitor, you would have to buy a new monitor or get it replaced if its under warranty.

Same problem - unplug both computer and monitor - hold power button for monitor for 15-30 seconds...then power it back on and then power on the computer. Seems from other sites there is a power issue with the monitor - this worked for me.

You're monitor is probably broken and I'm afraid it has to be replaced.

I have repaired similar FPD models. I have one of them on this very desk.
The GatewayFPD models develop problems after a couple or more years of use. Therepairs are fairly easy for the savvy technician. The power inverterboard in the back of the monitor contains some capacitors, they may be470 and 220 mfd or 680 mfd depending on when they were made, @ 10 16 or 25volts, with a 105 deg. C temp rating. They go bad due to heat issuesand the currents they have to filter. Replacement of the capacitorsusually restores operation. Use capacitorss of the same ratings as original for replacement.

Be advised, turning the monitor off when you are not using it will extend the life between these repairs.

Hope you find this helpful.

I have repaired similar FPD models. I have one of them on this very desk.
The GatewayFPDmodels develop problems after a couple or more years of use. Therepairsare fairly easy for the savvy technician. The power inverterboard inthe back of the monitor contains some capacitors, they may be470 and220 mfd or 680 mfd depending on when they were made, @ 10 16 or25volts, with a 105 deg. C temp rating. They go bad due to heatissuesand the currents they have to filter. Replacement of thecapacitorsusually restores operation. Use capacitorss of the sameratings as original for replacement.

Be advised, turning the monitor off when you are not using it will extend the life between these repairs.

Hope you find this helpful.

Check your video card. it may be a bit lose in the port. Also, you should reinstall your video card drivers as well. make sure your monitor is plugged into the correct video card AVI/dvi input port.

try replacing the crystal on the power supply 8 out of 10 times it is the problem

Replacing the lcd screen more than likely. Problem in the PCB thats built onto the lcd itself.
They are rather inexpensive these days to replace. I would just buy a new one. Check warranties offered before buying, some manufacturers offer 3 years. ;)