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What should I do when Ubuntu freezes?

I am facing a serious problem as my Dell Optiplex 745 loaded with Ubuntu 12.04 32bit freezes with a blank screen no mouse cursor no keyboard activity in many occasions.

Sometimes when I open firefox, or software center, I really can't tell what the main problem is, but what i am certain about is it i have to do a hard reset to reboot.

I tried to use a live-cd to boot but it did the same, tried the recovery console but couldn't find a way to fix from there (I am a new user) suspected a hardware problem but windows runs flawlessly so I believe its something related to ubuntu.

Specs:
Intel Celeron D 3.06 GHZ
3.0 GB ram
Intel built in graphics Q965
1 TB HDD
Bios Phoenex 2.6.4

Please help I really love ubuntu and I don't want to go back to windows!

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mohamed
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    Welcome to Ask Ubuntu! Please share the output of the following files and/or commands with us to help you troubleshoot your problem [(**instructions** in this answer)](http://askubuntu.com/q/152371/58612): command `dmesg`, file `/var/log/kern.log` – ish Jun 27 '12 at 23:49
  • mate now i cant even access my system without a freeze ! – mohamed Jun 28 '12 at 00:39

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