how to fix a computer that turns the display off?

[Glenn Ian Catalan]

when i turn my pc on it is ok but when im watching video or playing online game it automatically turn off but only the screen and the fan gets faster. please help me thx.

 

[popatim]

Sounds like it shutting down due to overheating. Can you monitor your temps while this happens?

 

[Glenn Ian Catalan]

Sounds like it shutting down due to overheating. Can you monitor your temps while this happens?

popatim, yes i monitor it, it seems all right last time when im watching video it turns off the monitor. but when i reformat it last day i watch video without a problem, now my problem is when i play online games after i play maybe 20 mins - 30 mins. the monitor turns off . i dont know why.