i am tring to make my computer a big srceen

To help you better we need some infos about your hardware so please open a Terminal from the menu Applications->Accessories->Terminal and type:

lspci

lspci is lower of LSPCI

copy and paste result here.

Thank you

owner@ubuntu:~$ lscpi
bash: lscpi: command not found
owner@ubuntu:~$ lspci
00:00.0 Host bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo KT266/A/333]
00:01.0 PCI bridge: VIA Technologies, Inc. VT8366/A/7 [Apollo KT266/A/333 AGP]
00:06.0 Ethernet controller: Lite-On Communications Inc LNE100TX (rev 20)
00:11.0 ISA bridge: VIA Technologies, Inc. VT8233 PCI to ISA Bridge
00:11.1 IDE interface: VIA Technologies, Inc. VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06)
00:11.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 1b)
00:11.3 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 1b)
00:11.4 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 1b)
00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237 AC97 Audio Controller (rev 10)
01:00.0 VGA compatible controller: nVidia Corporation NV11 [GeForce2 MX/MX 400] (rev b2)
owner@ubuntu:~$

billy:

 you have configurate your VGA?

for example:

direct rendering, options of resolutions, panel control of Nvidia?
because, you need adjust you resolution right?

best,

Hi
I had a problem like that.
I did this, and it worked,
press alt+F2 in the box type
gksudo displayconfig-gtk
click RUN
try to change the resolution there,
or/and select your monitor model and the resolution when you click the "model button".
set the Hz LCD don't need to be over 60Hz normally, if the screen go's black don't panic it will return and try a different setting. if it work save setting.
hope this helps
Neil