I use aDSL connection,if i try opening gedit or something like,it simply shows starting gedit
...and stops after sometime.but if i stop my internet connxn,then all guis popup suddenly/?
what to do?what to do?what to do? Please Help!

Maybe you haven't configured the loopback interface in /etc/network/interfaces ? Check out if you have these lines:

auto lo
iface lo inet loopback

Previously i have some problems configuring aDSL on Sarge.so with help of local lug guys i edited /etc/network/interfaces:
[prakash@localhost etc]$ cat network/interfaces

iface lo inet loopback
address 127.0.0.1
netmask 255.0.0.0
broadcast 127.255.255.255
network 127.0.0.0

auto eth0
iface eth0 inet static
up ifconfig $IFACE 0.0.0.0 up
down ifconfig $IFACE down
name Ethernet LAN card


iface dsl-provider inet static
provider dsl-provider
# please do not modify the following line
pre-up /sbin/ifconfig eth0 up # line maintained by pppoeconf
name Unknown interface type

Is this correct?also i need to run poff -a several times to stop numerous pppds that starts with when i type pon dsl-provider?

Open the app using a terminal, that way you get the error message and that would make it easier to solve the problem.

Open a terminal window and do as root "ifconfig". If the output doesn't include lo, then the loopback interface is not properly configured.