Computer flashing on and off

So I build my computer a year ago, its been working fine for the entire time. But, just recently, out of nowhere, whenever i click power on, the computer keeps flashing on and off. The only sound i hear is normal, its just my power supply turning on. Ive messed with it for the entire month and it hasnt been working. Tell me ur opinion on how to fix this.

Thanks in advance.

Submitted March 31, 2018 at 06:51PM by popeldd https://ift.tt/2GYpwRg