I just upgraded the mobo, cpu and ram for an old pc. The image goes blank as if it were changing resolution, then image comes back after a few seconds with the same resolution. Tried multiple monitors with vga cable only, multiple hard disks, multiple DVD drives. Tried disconnecting hddleds, evenly distributed paste on cpu, checked cpu pins as far as my eyes go and still nothing. It's not consistent but when image comes back, most of the time there is a spike in hd or cpu activity. While installing windows, happened uncountable times. I don't have other mobos to try. I tried isolating the mobo from case too. Worked fine for a moment, then started again. Mobo is gigabyte B250M-DS3H with 8gb 2400mhz ballistix ram and i5-7400 kaby lake. HD is Samsung HD322HJ. Thanks