where have you got dosbox from?
what are your PC specifications?

post content of "DOSBox Status Window" (in Windows: right click on its title bar -> edit)
enclose your dosbox's config file

I downloaded the file on the official page :
http://www.dosbox.com/download.php?main=1

PC specifications :
Windows 7 Edition Familiale Premium
ASUS Notebook K42jv Series
Intel Core i5 M430 2.27 gHz 4Go de RAM
Système d'exploitation 64 bits

Content of "DOSBox Status Window"
DOSBox version 0.74
Copyright 2002-2010 DOSBox Team, published under GNU GPL.
---
CONFIG:Loading primary settings from config file C:\Users\Romuald\AppData\Local\
DOSBox\dosbox-0.74.conf
MIDI:Opened device:win32
DOS keyboard layout loaded with main language code FR for layout fr

What's "funny" :
- I did the same installation between my PC Windows XP and Windows 7 : it works on XP and not on 7
- I share my keyboard and my mouse (thanks a KVM switcher) between my to PCs
- so it seems the problem is due to Windows 7 or my new computer ?!?

tried other output types?
tried without language file?

I tried without language file. No difference.

What do you mean with output types ? Keyboard ?

What is strange, it's the same keyboard and mouse with both PC, and it worked on XP, not on 7. And I did the same installation between the two PC (= just installation + language file).

output= in configfile

I tried all different values for output
When I use : surface, overlay or ddraw : no difference
When I use : opengl or openglnb, it crushes my PC (I have to start it again)

I tried something else : fullscreen=true
Andwhat a surprise : I have the whole menu, but when I use my keyboard, I see nothing.
Then I tip "alt + enter".
I have the small black window (I don't even see the blue menu).
I tip "alt + enter" again.
And surprise again : I have the menu + what I tapped before + the execution of my code.
For example, if I tipped "dir", I see after two "alt + enter" dir and all the directories...

I tried then : fullscreen=false
Black window as usually.
Then I tip "alt + enter" and it's like described before : the whole blue menu, but I don't see what I tip.

There is a problem of "refreshing" the screen we can say...

As said before, when i tip "exit", i don't see anything (small or big window), but the window close...

Have you any idea ?

Is there another parameter I can modify ?

Thanks for your help...

try
dosbox.exe -noconsole

only one window open
the second one
still black

same as before when I tip "alt + entrée" (fullscreen with blue menu etc...)

Rombu2010 wrote:

only one window open
the second one
still black

I don't understand what do you mean

I don't see the DOSBox status Window, only the DOSBox CPU Speed.
And this window is black as usually.

check the manual for windib

???
I don't know windib

u now manual?

no

http://www.dosbox.com/DOSBoxManual.html

Rombu, make sure your graphics card driver is OK. Download the newest from the ATI or NVIDIA (or Intel or whatever) web site and reinstall it.

TeaRex, I did, no change, black window

Robertmo, some progress !!!
When I run cmd.exe, navigate to DOSBox program folder and type:
set sdl_videodriver=windib
dosbox.exe
It works

As said before, but to be clear now : I use a KVM switcher. My Windows 7 PC is a laptop (so it has its own keyboard+mouse+screen) + I use a wireless external keyboard connected to the KVM switcher (and a wireless mouse and a big screen).
So my laptop PC has somewhere two keyboards, two mouses and two screens, the first one direct from my laptop, the second one connected to the KVM.

Is that the key of my problem ?
Should I configure the DOSBox conf somewhere to explain that ?

or should I write somewhere in the shortcut dosbox
"set sdl_videodriver=windib" ?