I HAD  instaled mixed

some libraries  of   375.39, nvidia-legacy-304xx-alternative and nvidia-legacy-340xx-alternative ,

well  nvidia-legacy-304xx-alternative and nvidia-legacy-340xx-alternative install today, 
375  time ago...

SOLUTION:
remove all with

   aptitude purge ~i~nnvidia  

   apt-get install nvidia-legacy-304xx-kernel-dkms   nvidia-xconfig 

   nvidia-xconfig 

#  reboot

tanks for help me

and tanks to  <somiaj> of  #debian

and not  work

not work  with 

     BusID           "PCI:0000:00:0d.0"

at    /etc/X11/xorg.conf 

and not work  with comment (#)   BusID    line.

Also, if you would put listings etc in code blocks, i.e. within a pair of [code] and [/code], it'd be easier to read.

cat /etc/issue.net
Devuan GNU/Linux ascii

uname -a
Linux pc  4.9.0-2-686 #1 SMP Debian 4.9.10-1 (2017-02-17) i686 GNU/Linux

lspci | grep -i VGA
00:0d.0 VGA compatible controller: NVIDIA Corporation C61 [GeForce 7025 / nForce 630a] (rev a2)

# nvidia-detect
Detected NVIDIA GPUs:
00:0d.0 VGA compatible controller [0300]: NVIDIA Corporation C61 [GeForce 7025 / nForce 630a] [10de:03d6] (rev a2)

Checking card:  NVIDIA Corporation C61 [GeForce 7025 / nForce 630a] (rev a2)
Your card is only supported up to the 304 legacy drivers series.
It is recommended to install the
    nvidia-legacy-304xx-driver
package.

#############################
currently installed

   nvidia-legacy-304xx-driver

###############################
#  lshw -C display

  *-display UNCLAIMED       
       description: VGA compatible controller
       product: C61 [GeForce 7025 / nForce 630a]
       vendor: NVIDIA Corporation
       physical id: d
       bus info: pci@0000:00:0d.0
       version: a2
       width: 64 bits
       clock: 66MHz
       capabilities: pm msi vga_controller bus_master cap_list
       configuration: latency=0
       resources: memory:fb000000-fbffffff memory:d0000000-dfffffff memory:fc000000-fcffffff memory:c0000-dffff

#########################################

lspci -v -s `lspci | awk '/VGA/{print $1}'`
00:0d.0 VGA compatible controller: NVIDIA Corporation C61 [GeForce 7025 / nForce 630a] (rev a2) (prog-if 00 [VGA controller])
    Subsystem: Gigabyte Technology Co., Ltd C61 [GeForce 7025 / nForce 630a]
    Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 11
    Memory at fb000000 (32-bit, non-prefetchable) [size=16M]
    Memory at d0000000 (64-bit, prefetchable) [size=256M]
    Memory at fc000000 (64-bit, non-prefetchable) [size=16M]
    [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
    Capabilities: [48] Power Management version 2
    Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
    Kernel modules: nouveau, nvidia_legacy_340xx, nvidia_current_drm, nvidia_current

#################################

lspci |grep NVIDIA

00:0d.0 VGA compatible controller: NVIDIA Corporation C61 [GeForce 7025 / nForce 630a] (rev a2)

################################

cat /etc/X11/xorg.conf
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 375.26  (buildd@debian)  Fri Jan 13 02:38:29 UTC 2017

....
......

Section "Device"

   BusID           "PCI:00:0d.0"   
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "ConnectedMonitor" "CRT"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

##############################

# cat /etc/X11/xorg.conf

[    38.001] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration
[    38.001] (--) PCI:*(0:0:13:0) 10de:03d6:1458:d000 rev 162, Mem @ 0xfb000000/16777216, 0xd0000000/268435456, 0xfc000000/16777216, BIOS @ 0x????????/131072
[    38.001] (II) LoadModule: "glx"
[    38.001] (II) Loading /usr/lib/xorg/modules/linux/libglx.so
[    38.019] (II) Module glx: vendor="NVIDIA Corporation"
[    38.019]     compiled for 4.0.2, module version = 1.0.0
[    38.019]     Module class: X.Org Server Extension
[    38.019] (II) NVIDIA GLX Module  375.39  Tue Jan 31 19:16:46 PST 2017
[    38.019] (II) LoadModule: "nvidia"
[    38.019] (II) Loading /usr/lib/xorg/modules/drivers/nvidia_drv.so
[    38.020] (II) Module nvidia: vendor="NVIDIA Corporation"
[    38.020]     compiled for 4.0.2, module version = 1.0.0
[    38.020]     Module class: X.Org Video Driver
[    38.020] (II) NVIDIA dlloader X Driver  375.39  Tue Jan 31 18:51:54 PST 2017
[    38.020] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[    38.023] (EE) No devices detected.
[    38.023] (EE)
Fatal server error:
[    38.023] (EE) no screens found(EE)

################
dmesg

nvidia: loading out-of-tree module taints kernel.
[   12.439563] nvidia: module license 'NVIDIA' taints kernel.
[   12.439598] Disabling lock debugging due to kernel taint
[   12.451671] nvidia: module verification failed: signature and/or required key missing - tainting kernel
[   12.458072] NVRM: The NVIDIA GeForce 7025 / nForce 630a GPU installed in this system is
               NVRM:  supported through the NVIDIA 304.xx Legacy drivers. Please
               NVRM:  visit http://www.nvidia.com/object/unix.html for more
               NVRM:  information.  The 340.102 NVIDIA driver will ignore
               NVRM:  this GPU.  Continuing probe...
[   12.458192] NVRM: No NVIDIA graphics adapter found!

....
NVRM: The NVIDIA GeForce 7025 / nForce 630a GPU installed in this system is
               NVRM:  supported through the NVIDIA 304.xx Legacy drivers. Please
               NVRM:  visit http://www.nvidia.com/object/unix.html for more
               NVRM:  information.  The 375.39 NVIDIA driver will ignore
               NVRM:  this GPU.  Continuing probe...
[   15.945341] NVRM: No NVIDIA graphics adapter found!
[   17.687534] ACPI: PCI Interrupt Link [AIGP] enabled at IRQ 21
[   17.687581] vgaarb: device changed decodes: PCI:0000:00:0d.0,olddecodes=io+mem,decodes=none:owns=io+mem
[   17.688366] [drm] Initialized nvidia-drm 0.0.0 20150116 for 0000:00:0d.0 on minor 0
[   17.688417] NVRM: loading NVIDIA UNIX x86 Kernel Module  304.134  Fri Dec  9 11:47:15 PST 2016

######

  lshw -C display 
show :           bus info: pci@0000:00:0d.0

and

lspci |grep NVIDIA

show:     00:0d.0    ...

whats its true ? 
0000:00:0d.0 OR   00:0d.0

to wirte at  /etc/X11/xorg.conf

#######################

tanks for  help me