Gnome freezes with screen resolution change

I have on old Dell computer for learning Arch. I installed gnome
and my screen looks fuzzy. I checked the screen resolution it
was set beyond the recomended resolution of the monitor (1024X768).
I set the resolution to 1024X768 and clicked "apply". The resolution
changed and indeed looked sharper, but the computer immediatly froze.
I had to power down and up after which the settings were lost.
I have no idea if this is a hardware or software problem. It would
seem that (perhaps) if 1024X768 were put in a configuration file,
the problem might be averted. But what configuration file?
Any help would be appreciated.

I believe you can change your default resolution in the file
/etc/xorg.conf
Check this section of the wiki :
http://wiki.archlinux.org/index.php/Xorg#Resolution

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Hallo to all the people out here!!!
I'm quite new to linux. I've been using Ubuntu and Mint for sometime but I decided to switch to Arch, since I decided to have more control over my machines. Before I go on I must clear out that most of those machines are build from old spare items.
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2. In the log in screen (I'm using SLIM)can not see what I type
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There's a strange sound like flick of a switch every time the resolution changes
I've searched for similar problems but found nothing close to mine, and get more and more confused and i think i'm gonna mess everything up...
Thanx in advance for the help!
These outputs I think that will be useful :
uname -a
Linux archbox 3.3.2-1-ARCH #1 SMP PREEMPT Sat Apr 14 10:08:43 UTC 2012 i686 Intel(R) Celeron(R) CPU 2.80GHz GenuineIntel GNU/Linux
lspci | grep VGA
01:00.0 VGA compatible controller: NVIDIA Corporation NV34 [GeForce FX 5200] (rev a1) (prog-if 00 [VGA controller])
lsmod
Module Size Used by
fuse 59348 2
firewire_ohci 27283 0
firewire_core 44257 1 firewire_ohci
8139too 17280 0
8139cp 16043 0
snd_intel8x0 22672 0
ppdev 4750 0
crc_itu_t 1095 1 firewire_core
mii 3439 2 8139cp,8139too
snd_ac97_codec 89900 1 snd_intel8x0
parport_pc 26601 0
iTCO_wdt 10773 0
ac97_bus 874 1 snd_ac97_codec
shpchp 22557 0
iTCO_vendor_support 1545 1 iTCO_wdt
snd_pcm 60499 2 snd_ac97_codec,snd_intel8x0
snd_page_alloc 5901 2 snd_pcm,snd_intel8x0
snd_timer 15158 1 snd_pcm
snd 45013 4 snd_timer,snd_pcm,snd_ac97_codec,snd_intel8x0
floppy 49063 0
thermal 6563 0
fan 1902 0
soundcore 4986 1 snd
pcspkr 1423 0
i2c_i801 6992 0
parport 26479 2 parport_pc,ppdev
intel_agp 8688 1
processor 23476 0
pci_hotplug 21878 1 shpchp
intel_gtt 11193 1 intel_agp
evdev 7310 5
ext4 385004 3
crc16 1091 1 ext4
jbd2 60590 1 ext4
mbcache 4345 1 ext4
usbhid 31477 0
hid 66633 1 usbhid
sr_mod 13148 0
cdrom 30504 1 sr_mod
sd_mod 25867 5
pata_acpi 2388 0
ata_generic 2391 0
ata_piix 18616 4
libata 145775 3 ata_piix,ata_generic,pata_acpi
scsi_mod 112765 3 libata,sd_mod,sr_mod
uhci_hcd 19712 0
ehci_hcd 38480 0
usbcore 122719 4 ehci_hcd,uhci_hcd,usbhid
usb_common 622 1 usbcore
nouveau 700360 2
button 3614 1 nouveau
video 9819 1 nouveau
mxm_wmi 1101 1 nouveau
wmi 7259 2 mxm_wmi,nouveau
drm_kms_helper 23303 1 nouveau
ttm 46603 1 nouveau
drm 166804 4 ttm,drm_kms_helper,nouveau
agpgart 22159 4 drm,ttm,intel_gtt,intel_agp
i2c_core 16845 4 drm,drm_kms_helper,nouveau,i2c_i801
my screen configuration placed in /etc/X11/xorg.conf.d/20-mntrstp.conf
Section "Monitor"
Identifier "Monitor0"
# Modeline "1280x1024_60.00" 108.88 1280 1360 1496 1712 1024 1025 1028 1060 -HSync +Vsync
# Option "PreferredMode" "1280x1024_60.00"
EndSection
Section "Device"
Identifier "Nvidia card"
Driver "nouveau"
EndSection
Section "Screen"
Identifier "Screen0" #Collapse Monitor and Device section to Screen section
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24 #Choose the depth (16||24)
SubSection "Display"
Depth 24
Modes "1280x1024_60.00" "1024x768" "640x480" #Choose the resolution
EndSubSection
EndSection
xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 4096 x 4096
VGA-1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
1024x768 60.0*
800x600 60.3 56.2
848x480 60.0
640x480 59.9
DVI-I-1 disconnected (normal left inverted right x axis y axis)
TV-1 disconnected (normal left inverted right x axis y axis)

OK I just renamed my configuration file from 20-mntrstp.conf to 20-nouveau.conf
(I thought that the number 20 was the important part not the name itself)but nothing's changed.
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And my menu.lst looks like this:
# Config file for GRUB - The GNU GRand Unified Bootloader
# /boot/grub/menu.lst
# DEVICE NAME CONVERSIONS
# Linux Grub
# /dev/fd0 (fd0)
# /dev/sda (hd0)
# /dev/sdb2 (hd1,1)
# /dev/sda3 (hd0,2)
# FRAMEBUFFER RESOLUTION SETTINGS
# +-------------------------------------------------+
# | 640x480 800x600 1024x768 1280x1024
# ----+--------------------------------------------
# 256 | 0x301=769 0x303=771 0x305=773 0x307=775
# 32K | 0x310=784 0x313=787 0x316=790 0x319=793
# 64K | 0x311=785 0x314=788 0x317=791 0x31A=794
# 16M | 0x312=786 0x315=789 0x318=792 0x31B=795
# +-------------------------------------------------+
# for more details and different resolutions see
# https://wiki.archlinux.org/index.php/GRUB#Framebuffer_resolution
# general configuration:
timeout 5
default 0
color light-blue/black light-cyan/blue
# boot sections follow
# each is implicitly numbered from 0 in the order of appearance below
# TIP: If you want a 1024x768 framebuffer, add "vga=773" to your kernel line.
# (0) Arch Linux
title Arch Linux
root (hd0,0)
kernel /vmlinuz-linux root=/dev/disk/by-uuid/4950a9db-cefe-4b24-a523-fbb375d5b6e3 ro
initrd /initramfs-linux.img
# (1) Arch Linux
title Arch Linux Fallback
root (hd0,0)
kernel /vmlinuz-linux root=/dev/disk/by-uuid/4950a9db-cefe-4b24-a523-fbb375d5b6e3 ro
initrd /initramfs-linux-fallback.img
# (2) Windows
#title Windows
#rootnoverify (hd0,0)
#makeactive
#chainloader +1
Yes I've followed the wiki, but I'm not sure if i messed up anything as i was trying to solve the problem. Also I'm not a very experienced Linux user so a lot of things are made without necessarily understanding the whole of them.

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