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flickering problem

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Flicker can be tough to track down. It may have a hardware-related cause like a cold solder joint or cracked trace. If it's a trace on an internal plane of a multilayer board, it's almost impossible to find, and simply removing the board can be enough to touch the ends of the trace back together again.

OTOH, software can cause major flicker problems too. The CPU and GPU are trying to create the image, while at the same time the video display expects a constant stream of data. If the wrong task gets priority, the display signal may be interrupted and cause flicker. (Old-timers: remember reading the horizontal retrace and vertical blanking signals on the CGA to avoid "sparkle"?)

So first, I'd check the boards and the manufacturer's website. See if there are new MB drivers for your system, and install the update. Also check the release notes to see if it mentions a fix for flicker.

If that doesn't fix it, see if you can get the new PS tested - sometimes they aren't perfect, and yes the PS may cause the flicker too. It's easier to change the PS than the mobo.

And if those don't fix it, you may want to send the mobo back for test and repair.

Good Luck.