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Had new graphics card but picture keeps dropping - screen goes black for 2 seconds then flashes back up again then immediately goes black again for 2 seconds and then returns.  Maybe will be 10 minutes before it does it again

Question asked by lamouette on Aug 25, 2016
Latest reply on Aug 26, 2016 by derrickgott007

Screen keeps going black for a couple of seconds then OK, then black again for couple seconds and returns again.   Maybe it will be OK for 10 minutes maybe an hour.

One other odd thing is that when PC switched on and the windows is loading with the four colours coming into focus, 2 dotted lines appear, one after the other across the centre of the screen, then welcome screen appears.

This is all since new graphics card fitted by engineer/technician.

Any help would be greatly appreciated.