Samsung syncmaster 172v Screen goes black after about one second. Comes back to normal after turned off, but goes black again in about one second. Rebooting computer has not fixed this.

more than likely your video card has gone bad .. try to get a new video card and install it or take computer to your computer shop and have them replace it for you

It is only stays on for 2 seconds then your capacitors are bad. If it is only going out for a few seconds that it is probably auto refreshing.

I had the same problem with this monitor (Samsung 943nw)
When turned on it would only stay on for less then a full second.
When shining a light on the screen I could see what was on it, so it was just the backlight that was shutting down.

After I turned down the brightness of the monitor, the next time I powered on the screen the backlight stayed lit and it was back to normal.

You should get three years warranty, if you can locate your receipt and contact them direct they will sort it for you :)

Good luck

I had a similar problem with my LCD computer screen. I took it apart and noticed a capacitor that was raised up on the flat end and appeared to be leaking a substance. Replaced it with a similar capacitor and works fine, for three years now.

Could be a power issue. If it doesn't show anything at all then that may be the case. It may also be the display itself. It would be a costly repair so you might be better off finding a new monitor.

Got the same problem, happened yesterday for me, Did some research and it looks like its bad capacitors in the back, check out this page for more information... i'm taking mine to an electrician to fix today... luckily he's related and should be able to fix it on the cheap...

http://pavel.kirkovsky.com/blog/2009/03/samsung-syncmaster-204b-repair/

i think u have a problem with ur display,please contact ur service centre immediately to fix it.

If you can still faintly see data on your screen, it will be a faulty backlight in the panel most likely.

LCD panels have fluorescent tubes in them that provide the light needed to see the data. If one of these goes faulty, the circuit that drives it will turn off ALL the backlights, giving you a black screen.
Note: a faulty circuit that drives the backlights will often give the same apparent fault.
You will need to take the monitor in for repair.

Unfortunately, you two have two unrelated problems. CB, the monitor isn't asking you for the password, that's the computer itself going into hibernation, which shuts down the video output, hard drive, etc. You need to go into the power-save settings and either disable hibernate, or change the settings to your liking.

The other question about the screen staying on for 5 seconds... thats an inverter board problem.