1) Are you using the proper power cord from power adapter to the outlet for your country, so the connection is properly grounded?
2) If so, is the outlet you are using for electrical power properly grounded?
Improper grounding can cause a transformer (power adapter) to burn out, operate at less capacity, or fail to operate. It is important to note that a surge protector cannot protect against improper grounding.
G74SX-A1 - stock hardware - BIOS 202 - 2nd Monitor VISIO VF551XVT