And music at background.
Use google, delete dirs from alpha, beta version, use r_fullscreenpreemption = 0 but .... nothing. Install latest AMD beta 7 drivers, nothing.
Video AMD7970, WIN 7 64 bit. Use alt-tab and back. Play few days - all ok. Today download Cvar, run it, look, but nothing change. Delete autoexec, system config - nothing. After than make anew with r_fullscreenpreemption = 0 nothing. Help.

Make repair game, nothing.

UPD

I hope search it
In Crysis3/LogBackups find

Using speaker mode: FMOD_SPEAKERMODE_STEREO
Initializing FMOD-EX now!
Initialized FMOD-EX
Using FMOD version: 00044211 and internal 00044211!
Initializing SoundSystem now!
Renderer initialization
Logging video adapters:
- AMD Radeon HD 7900 Series (vendor = 0x1002, device = 0x6798)
- Adapter index: 0
- Dedicated video memory: 3045 MB
- Feature level: DX11 (SM 5.0)
- Displays connected: yes
- Suitable rendering device: yes
- Intel(R) HD Graphics 3000 (vendor = 0x8086, device = 0x0122)
- Adapter index: 1
- Dedicated video memory: 64 MB
- Feature level: DX10.1 (SM 4.x)
- Displays connected: no
- Suitable rendering device: no
Localized language content(english) not available or modified from the original installation.
Localized language content(english) not available or modified from the original installation.
Localized language content(english) not available or modified from the original installation.
Localized language content(english) not available or modified from the original installation.
Network initialization
[net] Socket IO management: External [LobbyIDAddr], Internal [iocp]
network hostname: *********
ip:*******
[Network Version]: RELEASE PURE CLIENT
Lobby initialization
MovieSystem initialization
Console initialization
Time initialization
Input initialization
AI initialization


New string which not in previous log when worked

Localized language content(english) not available or modified from the original installation.
Localized language content(english) not available or modified from the original installation.
Localized language content(english) not available or modified from the original installation.
Localized language content(english) not available or modified from the original installation.

In register stand locale Ru_ru.

'Thanks to all!" Solved.

Sometimes good to be not noob.

In system.cfg

sys_languages=russian
g_language=russian

This all i write to another people if they ever have similar problem. (I check, google search machine good work at that site and pretty cache all posts).