Gentoo user: gnome worked, but i broke xorg.conf. Still won't work after Xorg -configure...

[achtzehn]

I just completed a Gentoo install, I emerged both xorg-x11 and gnome xscreensaver with no errors. Gnome actually WORKED for a time, and then I read that I was supposed to add some Section to /etc/X11/xorg.conf (I can't remember what it was)... However, I wasn't thinking too hard and when xorg.conf opened, it was completely blank for some reason (maybe I opened to the wrong location?)... I saved it with the single section, and only after did I realize that this may have been a mistake... I tried 'gdm' again, and it wouldn't work. So, I just tried 'Xorg -configure', and it said

Xorg is not able to detect your mouse.
Edit the file and correct the Device.

Thinking a mouse alone wouldn't prohibit Gnome from starting, I copied /root/xorg.conf.new to /etc/X11/xorg.conf and tried 'gdm'; the screen flickers a few times and an error message comes up:

Fatal server error:
no screens found

[...irrelevant stuff...]

=====================================================================
I cannot start the X server (your graphical interface). It is likely
that it is not set up correctly. You will need to log in on a console
and rerun the X configuration program. Then restart GDM.
=====================================================================

I also tried 'xorgcfg -textmode', but I couldn't make sense of what to do... Here are my questions:

1. If you recognize the problem immediately, could you tell me what to do?
2. How do I figure out the specs of my computer so I can do 'xorgcfg -textmode' on my own (this is maybe more important... I had to install gnome on my small Thinkpad 240 laptop by swapping harddrives into a Thinkpad R51 so that I could use it's cdrom)?

For reference, here are my /etc/rc.conf and /etc/X11/xorg.conf :

/etc/rc.conf

Keymap="us"
SET_WINDOWKEYS"no"
EXTENDED_KEYMAPS=
CONSOLEFRONT="default8x16"
CLOCK="UTC"
EDITOR="/bin/nano"
PROTOCOLS="1 2"
DISPLAYMANAGER="gdm"
XSESSION="Gnome"

/etc/X11/xorg.conf

Section "ServerLayout"
        Identifier     "X.org Configured"
  	  Screen	  0  "Screen0" 0 0
        InputDevice    "Mouse0" "CorePointer"
 	  InputDevice    "Keyboard"
EndSection

Section "Files"
        RgbPath	     "/usr/lib/X11/rgb"
        ModulePath     "/usr/lib/modules"
	  FontPath	     "/usr/share/fonts/misc/"
	  FontPath	     "/usr/share/fonts/TTF/"
	  FontPath	     "/usr/share/fonts/Type1/"
	  FontPath	     "/usr/share/fonts/CID/"
	  FontPath	     "/usr/share/fonts/75dpi/"
	  FontPath	     "/usr/share/fonts/100dpi/"
EndSection

Section "Module"
        Load  "extmod"
        Load  "dri"
        Load  "dbe"
        Load  "record"
        Load  "xtrap"
        Load  "glx"
        Load  "type1"
        Load  "freetype"
EndSection

Section "InputDevice"
        Identifier  "Keyboard0"
	  Driver	  "kbd"
EndSection

Section "InputDevice
	  Identifier  "Mouse0"
	  Driver	  "mouse"
	  Option      "Protocol" "PS2/2"
	  Option      "Device" "/dev/mouse"
	  Option      "Emulate3Buttons"
EndSection

Section "Monitor"
        Identifier  "Monitor0"
	  VendorName  "Monitor Vender"
	  ModelName	  "Monitor Model"
EndSection

Section "Device"

        ### Available Driver options are:-
        ### Values&#58; [i]&#58; integer, <f>&#58; float, <boot>&#58; "True"/"False",
        ### <string>&#58; "String", <freq>&#58; "<f> Hz/kHz/MHz"
        ### &#91;arg&#93;&#58; arg optional 
        #Option 	 "noAccel"			# &#91;<bool>&#93;
        #Option 	 "SWcursor"			# &#91;<bool>&#93;
        #Option 	 "ColorKey"			# [i]
        #Option 	 "CacheLines"		# [i]
        #Option 	 "Dac6Bit"			# &#91;<bool>&#93;
        #Option  	 "DRI"				# &#91;<bool>&#93;
        #Option 	 "NoDDC"			# &#91;<bool>&#93;
        #Option 	 "ShowCache"			# &#91;<bool>&#93;
        #Option 	 "XvMCSurfaces"		# [i]
        #Option    "PageFlip"			# &#91;<bool>&#93;
        Identifier "Card0"
	  Driver	 "i810"
	  VendorName "Intel Corp."
	  BoardName  "82852/855GM Integrated Graphics Device"
 	  BusID	 "PCI&#58;0&#58;2&#58;0"
EndSection

Section "Screen"
	  Identifier "Screen0"
	  Device	 "Card0"
	  Monitor	 "Monitor0"
	  SubSection "Display"
		Viewport	0 0
		Depth		1
	  EndSubSection
	  SubSection "Display"
		Viewport	0 0
		Depth		4
	  EndSubSection
	  SubSection "Display"
		Viewport	0 0
		Depth		8
	  EndSubSection
	  SubSection "Display"
		Viewport	0 0
		Depth		15
	  EndSubSection
	  SubSection "Display"
		Viewport	0 0
		Depth		16
	  EndSubSection
	  SubSection "Display"
		Viewport	0 0
		Depth		24
	  EndSubSection
EndSection

I've been looking around for two days on HOWTOs now, it's becomming extremely frustrating, since everyone says it's easy to get gnome to work... Any help would be deeply appreciated... I'm pretty new to linux, and don't quite understand how this all works... Thanks in advace

[variant]

firsltly, post the "irelevant stuff" which is actualy the error message.

[achtzehn]

This is the exact error message:

Markers: (--) probed, (**) from config file, (==) default setting, 
        (++) from command line, (!!) notice, (II) informational, 
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: “/var/log/Xorg.0.log”, Time: Mon Aug 8 02:34:59 2005
(==) Using config file: “/etc/X11/xorg.conf”
(EE) No devices detected.

Fatal server error:
No screens found

Please consult the The X.Org Foundation support
         At http://wiki.X.Org
 for help.
Please also check the log file at “/var/log/Xorg.0.log” for additional information. 


===================================================================== 
I cannot start the X server (your graphical interface). It is likely 
that it is not set up correctly. You will need to log in on a console 
and rerun the X configuration program. Then restart GDM. 
=====================================================================

Since the log file is huge, I include only the lines of it that contain (WW), (EE), (NI), (??) and the stuff leading up to the very end
This is the exact error message:

Markers: (--) probed, (**) from config file, (==) default setting, 
        (++) from command line, (!!) notice, (II) informational, 
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: “/var/log/Xorg.0.log”, Time: Mon Aug 8 02:34:59 2005
(==) Using config file: “/etc/X11/xorg.conf”
(EE) No devices detected.

Fatal server error:
No screens found

Please consult the The X.Org Foundation support
         At http://wiki.X.Org
 for help.
Please also check the log file at “/var/log/Xorg.0.log” for additional information. 


===================================================================== 
I cannot start the X server (your graphical interface). It is likely 
that it is not set up correctly. You will need to log in on a console 
and rerun the X configuration program. Then restart GDM. 
=====================================================================

Since the log file is huge, I include only the lines of it that contain (WW), (EE), (NI), (??) and the stuff leading up to the very end

[...]{no errors up to here}
(WW) The directory “/usr/share/fonts/CDI/” does not exist. 
       Entry deleted from font path.
[...]{(**) marked lines}
(WW) Open APM failed (/dev/apm_bios) (no such file or directory)
[...]{Lots of stuff here with (II) markers. To give you an idea of where the problem came up, this next part is the last portion of the log}
(II) LoadModule: “kbd”
(II) Loading /usr/lib/modules/input/kbd_drv.o
(II) Module kbd: vendor=”X.Org Foundation”
	  compiled for 6.8.2, module version = 1.0.0
	  Module class: X.Org XInput Driver
	  ABI class: X.Org XInput driver, version 0.4
(II) I810: Driver for Intel Integrated Graphics Chipsets: i810, i810-dc100,
        i810e, i815, i830M, 845G, 852GM/855GM, 865G, 915G
(II) Primary Device is: PCI 00:09:0
(EE) No devices detected

Fatal server error:
No screens found

Please consult the The X.Org Foundation support
         At http://wiki.X.Org
 for help.
Please also check the log file at “/var/log/Xorg.0.log” for additional information.

[Cabhan]

Is this section accurate?

Section "Device"

        ### Available Driver options are:-
        ### Values&#58; [i]&#58; integer, <f>&#58; float, <boot>&#58; "True"/"False",
        ### <string>&#58; "String", <freq>&#58; "<f> Hz/kHz/MHz"
        ### &#91;arg&#93;&#58; arg optional
        #Option     "noAccel"         # &#91;<bool>&#93;
        #Option     "SWcursor"         # &#91;<bool>&#93;
        #Option     "ColorKey"         # [i]
        #Option     "CacheLines"      # [i]
        #Option     "Dac6Bit"         # &#91;<bool>&#93;
        #Option      "DRI"            # &#91;<bool>&#93;
        #Option     "NoDDC"         # &#91;<bool>&#93;
        #Option     "ShowCache"         # &#91;<bool>&#93;
        #Option     "XvMCSurfaces"      # [i]
        #Option    "PageFlip"         # &#91;<bool>&#93;
        Identifier "Card0"
     Driver    "i810"
     VendorName "Intel Corp."
     BoardName  "82852/855GM Integrated Graphics Device"
      BusID    "PCI&#58;0&#58;2&#58;0"
EndSection

As in, is this the graphics card you actually have? I usually get these errors when my graphics card either doesn't have the correct drivers installed or when I've given the wrong information to xorg.conf regarding said card.