Hi usbdevice

I have a similar problem to you with my Hanns-g HG281DJ.
The monitor is taking longer and longer to work when first switching on, but once it has warmed up it works fine.

I can also get it to work quicker if I press ctrl/alt/delete.
When the blue windows screen comes up with start task manager etc. it usually works fine.
If I then open the task manager and keep the task manager window open the monitor will be working much sooner than if I just leave it on the desktop screen.

There are also sometimes certain web pages which make the screen go black every few seconds which, amazingly enough, this page is doing right now.
If I come out of full screen on firefox the problem stops.

You mention that you only changed capacitors "C80 and C83".
What make of capacitors did you replace them with?

I have researched this a lot before, as there is so much stuff to read through, I thought I would be better contacting you directly.