My laptop model is not listed as supported hardware

Are you fully updated? Have you tested your RAM?

Yes my system is fully updated. I dont know how to test RAM ?

I have 3 GB RAM.
thanks

Boot from your CD, and run memtest from the boot menu once the CD has booted.

I have inserted my Kubuntu CD then there was an option test memory , I selected it then the system test was begin. After a long time it reported memory test passed successfully. Now any idea.
thanks

Do you have the latest BIOS?

How to check my BIOS is updated or not ?

thanks

sudo dmidecode -s bios-version

Will show it

Thanks @actionparsnip
the output is
babu@Moon:~$ sudo dmidecode -s bios-version
[sudo] password for babu:
A07
babu@Moon:~$

Now how can I test that A07 is up to date or not ?

I was talking with you(actionparsnip ) , besides I am doing a word document ,nothing more but just my system got hanged when I was going to switching between the two window. I have to forced shutdown with hardware button. thanks

A quick websearch shows:
http://search.dell.com/results.aspx?s=gen&c=us&l=en&cs=&k=Dell+inspiron+1440&cat=all&x=0&y=0

That A07 is the latest. I suggest you fsck the partition from the liveCD

I am new here please tell me what is "fsck" ? How to do that ?

thanks

Instead of instantly asking when you see an unfamiliar term, why not do a tiny bit of research. You will learn your OS faster as well as not 100% rely on support to get things done.

You would have easily found this at least:
https://help.ubuntu.com/community/SystemAdministration/Fsck

You will need to boot to liveCD /USB to test so that the partitions are not mounted

Sorry sir, actually I am finding the term through google, but I have seen the most term are best explained by the answers team here. I am facing the problem very much . If it is as multimedia problem that is not so important but it is very essential. so I am doing so . Sorry for this.

if you boot to livecd you can then run:

sudo fdisk -l

You can then see your partitions

if you fsck the one named 'Linux' then that will be the system partition, let it run and if it passes then its all good. If it stops halfway then either the drive is failing and should be tested with the manufacturers tool on the ultimate boot cd, or the memory is bad (the livecd runs purely in ram)

thank you once again for replying me , I have done as you said the output is

ubuntu@ubuntu:~$ sudo fdisk -l

Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xd46148c7

   Device Boot Start End Blocks Id System
/dev/sda1 1 387 3099648 82 Linux swap / Solaris
Partition 1 does not end on cylinder boundary.
/dev/sda2 * 387 6528 49329152 83 Linux
/dev/sda3 6528 22285 126568448 7 HPFS/NTFS
/dev/sda4 22285 38914 133570560 7 HPFS/NTFS
ubuntu@ubuntu:~$

I have read about the fsck ,but cant understand what should be the command line for me

I have tried with

fsck /dev/sda2

It gives access denied

please anyone can tell me what is exactly the command for my system.

thanks

fsck needs sudo

thank you sir, I have run as you advised and the output is

ubuntu@ubuntu:~$ sudo fdisk -l

Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xd46148c7

   Device Boot Start End Blocks Id System
/dev/sda1 1 387 3099648 82 Linux swap / Solaris
Partition 1 does not end on cylinder boundary.
/dev/sda2 * 387 6528 49329152 83 Linux
/dev/sda3 6528 22285 126568448 7 HPFS/NTFS
/dev/sda4 22285 38914 133570560 7 HPFS/NTFS
ubuntu@ubuntu:~$ sudo fsck /dev/sda1
fsck from util-linux-ng 2.17.2
fsck: fsck.swap: not found
fsck: Error 2 while executing fsck.swap for /dev/sda1
ubuntu@ubuntu:~$ sudo fsck /dev/sda2
fsck from util-linux-ng 2.17.2
e2fsck 1.41.12 (17-May-2010)
/dev/sda2: clean, 182436/3088384 files, 3635394/12332288 blocks
ubuntu@ubuntu:~$

Sir,
I came to know (from some sites)that it is not safe to run fsck for the data storage drive. It can loose data. I don't know exactly. For this reason I did't run fsck for my NTFS partitions. Sir,What should I do now ? Should I run fsck for those partitions.Please help me. I am a fan of Kubuntu. I want to use it.
thanks

You was asked to run fsck for Linux partition, not NTFS one. Please run command: sudo fsck /dev/sda2

 I am sorry to say @ delance please read my post carefully. Anyway thanks for replyig. I am posting some part from my previous post again. @ delance I have run command: sudo fsck /dev/sda2 ,, for the linux partition and the output is

ubuntu@ubuntu:~$ sudo fsck /dev/sda2
fsck from util-linux-ng 2.17.2
e2fsck 1.41.12 (17-May-2010)
/dev/sda2: clean, 182436/3088384 files, 3635394/12332288 blocks
ubuntu@ubuntu:~$

Now I dont know my system hardware supports Kubuntu or not.Any idea how can I solve my "hang/freeze" problem.
thanks

@ actionparsnip

What should I do now ? Actually you said

""if you fsck the one named 'Linux' then that will be the system partition, let it run and if it passes then its all good. If it stops halfway then either the drive is failing and should be tested with the manufacturers tool on the ultimate boot cd, or the memory is bad (the livecd runs purely in ram)."""

so I want to know is there any problem in My system RAM ? I am new in linux (ubuntu) . I want to use it. I have already said my problems. Please help me.
thanks

My ram is ok

thanks sir....................

Thanks actionparsnip, that solved my question.