EXPERT NEEDED!!!!!!!!!!! BIOS & Windows do not detect my laptop screen


Nov 12, 2007
Here are some details on my computer:
Toshiba P100 SD 802F
Video adapter : Geforce 7900 GS driver (original driver)
BIOS : 3.8 (latest driver)
All other driver are original
Windows XP media center with SP2

My problem is that Windows do not detect my laptop screen, only any external CRT or LCD I connect to it

How it start :
I install software MagicTune version witch is coming from samsung when you buying their external LCD display 226BW.
Install complete and ask to reboot
Just before reboot, a message error say that MagicTune could not install correctly.
Reboot computer and my laptop LCD is black but I can see it is powered because it is not the same black as when the laptop is close.
I plug my external LCD display and it automatiquelly show my BIOS password screen on it but not on my laptop screen.

I can boot normally and do everything with my external screen but in the menu configuration (Display properties setting), Windows do not detect my laptop screen.

What I did after :
I uninstall MagicTune
I run Mc Afee, AD Aware
Try key Fn + F5 and no effect except external screen goes black and come back (This is my key to stich between screen configuration)
I check with nvidia tool for clone screen and other setting
I check with display property, only detect the external screen
Desinstall nvidia driver, reboot and reinstall original driver
Start in safe mode
Check my BIOS and put setting dual screen on boot
I updated my BIOS from ver 2.0 to 3.8 (latest version)
Go back to earlier windows restore point
Complete format of harddrive and new windows installation

After format I still have all the same problem, no laptop screen for bios and in windows just on the external monitor.

I think I may have a problem with :
- the bios of my graphic card
- a cable to my laptop display have get disconected
- the laptop display is dead

But I don't know how to upgrade the bios of my graphic card... No bios for graphique card at toshiba web site :

Thanks in advance for your help


Mar 23, 2011
I am having the same issue with a Acer Laptop, with ATI Drivers for the mobile 200m ATI Graphics device onboard the laptop, I have FORCED an install of a 1100 xpress ATI Video Cards Drivers and got the screen to detect, but then an update from Windows 7 put the video card back to the 200m config and now even the 1100 xpress drive does not work. Your Screen is not dead your driver for your Video card is just not seeing your screen. DMA issue
Thread starter Similar threads Forum Replies Date
Abbas27 Laptop General Discussion 1
K Laptop General Discussion 1
S Laptop General Discussion 3
M Laptop General Discussion 7
O Laptop General Discussion 1
U Laptop General Discussion 4
J Laptop General Discussion 1
S Laptop General Discussion 4
P Laptop General Discussion 4
D Laptop General Discussion 2
D Laptop General Discussion 8
M Laptop General Discussion 10
T Laptop General Discussion 1
L Laptop General Discussion 5
M Laptop General Discussion 2
I Laptop General Discussion 1
S Laptop General Discussion 4
dodger46 Laptop General Discussion 1
M Laptop General Discussion 12
T Laptop General Discussion 4