May be your PSU.
from toms hardware
More about sharkoon wpm 700 bronze psu good
Chayan4400Jan 14, 2016, 7:12 AM
No better than any generic PSU. Sharkoon's units are Tier Five on Tom's Hardware's PSU Tier List (Link in signature). Quoting from that article:
Quote:
Tier Five
Avoid IMMEDIATELY. These units are highly unsafe to use. No such protections added, very thin gauge wiring used, false advertising and too much to list. Reference to a higher tiered unit for a better, money saving and a much safer unit. For your safety's sake, please don't order or pick one up for use in your system. These units are a potential fire hazard and could even kill you, let alone your system.
Not to be used even in low power builds for normal use, let alone gaming PCs.