Data cuts from monitor

The bari saxy nerd

Commendable
Oct 31, 2016
17
0
1,510
Sometimes my monitor randomly gets a no data message then turns off amd I have to restart my pc to get it back recently I can't go 20 min without this happening what's going on is it my gpu I have to wait till after Christmas to replace it can anyone help me do just that much
Specs
Nvidia gtx 640
Intel core 2 duo quad core
Asus p5n-d phoenix mobo
4gb ddr3 ram
600w psu
2 500gb hdd
Evision 19" digital monitor 144x900 native resolution