笔记本玩L4D黑屏求解

yunlu123

进入游戏之后只有配乐没有画面.
找到了video.txt和videodefaults.txt两个文件,但是里面的文件内容中却找不到改屏幕分辨率的字句.
望大侠们能帮我看一下我的这两个文件的内容应该怎么改才能解决黑屏问题.
其中"setting.fullscreen"  "1"改"0"换窗口我试过了,窗口依然是黑屏.
桌面刷新率是60.

文件内容:
"config"
{
"vendorid"  "4098"
"DeviceID"  "22581"
"setting.fullscreen"  "1"
"setting.nowindowborder"  "0"
"setting.aspectratiomode"  "0"
"setting.mat_vsync"  "1"
"setting.mat_monitorgamma"  "2.200000"
"setting.mat_queue_mode"  "-1"
"setting.cpu_level"  "0"
"setting.videoconfig_version"  "1"
"setting.mem_level"  "0"
"setting.gpu_mem_level"  "0"
"setting.mat_triplebuffered"  "0"
"setting.mat_grain_scale_override"  "1"
"setting.gpu_level"  "0"
"setting.mat_antialias"  "0"
}