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Screen flashes goes black every few minutes

HP Recommended
Prodesk 600G2 mini
Microsoft Windows 10 (64-bit)

Since a few weeks we are experiencing troubles with some of our Prodesk 600 mini G2. The screen flashes black every few minutes. We've tried to following:


- Update all drivers and install all windows updates

- Revert to previous windows update

- Different screens and cables

- Flash Bios


However, no matter what we try, the screen keeps flashing black every few minutes. The problem is also that this is our last day of warrenty and we can't reach HP after office hours. We'd like to have them repaired under warrenty, but we can't claim it since we cannot reach hp.

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