Catalyst on new install

Hello,

I'm trying to install Catalyst on my newly installed computer, however the aticonfig --initial doesn't update my xorg.conf properly.
I'm new to ATI (I've used the Nvidia prop. driver for years and installed it dozens of times) and I need some help on this.
I tried to find some help on the forums here and there, but I can't seem to find a satisfactory solution.

Here's the problem:

I installed Lenny 64-bit on my computer, debconf generates the following xorg.conf:

[snip]
Section "InputDevice"
    Identifier    "Generic Keyboard"
    Driver        "kbd"
    Option        "XkbRules"    "xorg"
    Option        "XkbModel"    "pc104"
    Option        "XkbLayout"    "us"
EndSection

Section "InputDevice"
    Identifier    "Configured Mouse"
    Driver        "mouse"
EndSection

Section "Device"
    Identifier    "Configured Video Device"
EndSection

Section "Monitor"
    Identifier    "Configured Monitor"
EndSection

Section "Screen"
    Identifier    "Default Screen"
    Monitor        "Configured Monitor"
EndSection

It seems to use the "vesa" driver, and this wouldn't be a problem if my screen resolution was correct (1680x1050 vs. 1400x1050 which vesa gives me).
After installing Catalyst and running aticonfig --initial this xorg.conf is generated:

[snip]
Section "ServerLayout"
    Identifier     "aticonfig Layout"
    Screen      0 "aticonfig-Screen[0]-0" 0 0
EndSection

Section "Files"
EndSection

Section "Module"
EndSection

Section "InputDevice"
    Identifier "Generic Keyboard"
    Driver      "kbd"
    Option        "XkbRules" "xorg"
    Option        "XkbModel" "pc104"
    Option        "XkbLayout" "us"
EndSection

Section "InputDevice"
    Identifier "Configured Mouse"
    Driver      "mouse"
EndSection

Section "Monitor"
    Identifier   "Configured Monitor"
EndSection

Section "Monitor"
    Identifier   "aticonfig-Monitor[0]-0"
    Option        "VendorName" "ATI Proprietary Driver"
    Option        "ModelName" "Generic Autodetecting Monitor"
    Option        "DPMS" "true"
EndSection

Section "Device"
    Identifier "Configured Video Device"
EndSection

Section "Device"
    Identifier "aticonfig-Device[0]-0"
    Driver      "fglrx"
    BusID       "PCI:1:0:0"
EndSection

Section "Screen"
    Identifier "Default Screen"
    Monitor    "Configured Monitor"
EndSection

Section "Screen"
    Identifier "aticonfig-Screen[0]-0"
    Device     "aticonfig-Device[0]-0"
    Monitor    "aticonfig-Monitor[0]-0"
    DefaultDepth     24
    SubSection "Display"
        Viewport   0 0
        Depth     24
    EndSubSection
EndSection

After a restart of X my screen goes blank but the backlight of my LCD is on, the computer becomes highly irresponsive but doesn't seem to hang completely.
I noticed the double sections, after I take them out the same still happens.

Can anyone post a working xorg.conf, preferably for (roughly) the same setup as listed below:

Lenny 64-bit on a

Gigabyte ep45-ds3r
C2D E8400
4 GB DDR2
Sapphire Radeon HD 4850 512mb

LSPCI:

00:00.0 Host bridge: Intel Corporation Eaglelake DRAM Controller (rev 02)
00:01.0 PCI bridge: Intel Corporation Eaglelake PCI Express Root Port (rev 02)
00:1a.0 USB Controller: Intel Corporation ICH10 USB UHCI Controller #4
00:1a.1 USB Controller: Intel Corporation ICH10 USB UHCI Controller #5
00:1a.2 USB Controller: Intel Corporation ICH10 USB UHCI Controller #6
00:1a.7 USB Controller: Intel Corporation ICH10 USB2 EHCI Controller #2
00:1b.0 Audio device: Intel Corporation ICH10 HD Audio Controller
00:1c.0 PCI bridge: Intel Corporation ICH10 PCI Express Port 1
00:1c.3 PCI bridge: Intel Corporation ICH10 PCI Express Port 4
00:1c.4 PCI bridge: Intel Corporation ICH10 PCI Express Port 5
00:1c.5 PCI bridge: Intel Corporation ICH10 PCI Express Port 6
00:1d.0 USB Controller: Intel Corporation ICH10 USB UHCI Controller #1
00:1d.1 USB Controller: Intel Corporation ICH10 USB UHCI Controller #2
00:1d.2 USB Controller: Intel Corporation ICH10 USB UHCI Controller #3
00:1d.7 USB Controller: Intel Corporation ICH10 USB2 EHCI Controller #1
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 90)
00:1f.0 ISA bridge: Intel Corporation ICH10 LPC Interface Controller
00:1f.2 IDE interface: Intel Corporation ICH10 4 port SATA IDE Controller
00:1f.3 SMBus: Intel Corporation ICH10 SMBus Controller
00:1f.5 IDE interface: Intel Corporation ICH10 2 port SATA IDE Controller
01:00.0 VGA compatible controller: ATI Technologies Inc Device 9442
01:00.1 Audio device: ATI Technologies Inc Device aa30
03:00.0 IDE interface: JMicron Technologies, Inc. JMB368 IDE controller
04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 02)
06:07.0 FireWire (IEEE 1394): Texas Instruments TSB43AB23 IEEE-1394a-2000 Controller (PHY/Link)

Thanks for your help

Peter van der Wal