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The screen goes black then comes back. When it comes back are you able to use the computer without any problems? When does this happen? Most times during the boot process the screen will fade in and out.
If this is not happening when you boot the system it's possible that your lcd screen might be going bad so keep an eye on it.
Go into the Catalyst Control Center and check "reduce DVI
frequency on high-res displays" and leave "Alternate DVI operational
mode" checked. This should resolve it. It is because of your video card that this problem is occurring. Let me know if you need additional help or if this doesn't fix your problem. Good Luck.
Could be a weak Picture tube . You can try turning up the screen control but don't turn it up too much you'll get retrace lines in the picture . Turn it alittle at time until picture comes on then turn it down until the retrace lines go away . Then try turning the tv on and off to make sure it comes back on. Be careful you can get shocked if you do this while it is on and you touch one of the circuits . The control is on the flyback or the module thats on the picture tube it will say screen by it . If this does not work you could have vidoe problems or just the picture is no good . Good luck
1) pull chassis ( requires un-hooking extensive wire runs)
2) turn chassis upside-down
3) solder any / all bad connects,esp. regulator pins
Look for electrolytic capacitor leakage evidence =
dark,discoloration of trace material
4) replace any bad capacitors
5) re-install chassis and test