Bad PSU or Motherboard?

immortalgamer

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Oct 16, 2011
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Ever since I got a GTX 1050, I've been having a weird problem. Basically, the monitor randomly blacks out for a second and then comes back with no error. The light on the monitor stays on as well. I think this has something to do with the voltage because I can reproduce this problem by turning the lights on/off.

Now I highly doubt it's the GPU, because I only bought it a month ago. However, the PSU is over 5 years old and the motherboard is about 3 years old. I never had this problem when I was using the motherboard's onboard graphics or when I was using a Radeon HD 6850 (which required an external power cable compared to the GTX 1050 which gets it power through the motherboard).

So far I've tried using new DVI/HDMI cables (I've noticed that using a DVI cable causes this problem a little more often), tried another monitor and a TV, connected the PSU's cable directly to the wall socket, instead of a UPS but I haven't had any success and I'm out of ideas.

Has anyone had any issues like this?
Thanks.

Specs:
Motherboard - Gigabyte GA-78LMT-S2PT
CPU - Phenom II X4 965 BE
6GB DDR3 RAM
Power supply - Cooler Master Extreme power plus 500W
 

immortalgamer

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Oct 16, 2011
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Unfortunately, there's only one PCI-e slot on this motherboard. So, the PSU is not the problem then?