Hello, its Roxy. please help me and read my full problem.

At afernoon I just played Call of duty and suddenly my monitor stop viewing any objects. In those time the picture was stopped. Its blinking and some wired sound fron my speaker. I thought its for ram prob. So o dicied to restart my computer and than the prob start. now whenever I wished to open my computer I start USB and than CPU the monitor starts for sometime it shows the monitor's brand name and than shows "no signal" and than automatically CPU starts and the same thing goes. I also reinstall all plugs of PC and try to recheck reset PC's display cable BT not working...! What to do sir? Please help me!