Monitor goes blank but PC still running

Karen_1102

Reputable
Aug 17, 2014
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4,510
Hi. I got my PC about 5 months ago. It's got:
MSI 990-FXA GD-65
AMD FX-8350
Sapphire R7 270x
Thermaltake Toughpower Standard 650W

The problem first started 3 months ago. First it was rare and then it started to become regular. The screen would go black all of a sudden. But if there was a song playing it would keep playing. I took it to the professionals and they found nothing wrong with it. They didn't even face the black screen problem in the two weeks they had the PC. I changed my PSU and had the GPU replaced, but to no avail. The monitor has power but the keyboard doesn't work. There's nothing's wrong with the VGA cables. The cpu fans do not increase their speed when the monitor goes blank. Recently I noticed weird coloured pixels at bottom left corner of the screen. I mainly use the PC for CAD and related works. The monitor doesn't go blank when the PC is idle. Now I don't know what to do. If anyone could suggest anything I would be truly grateful.