When using the computer for a little while, it just freezes. The time that it takes varies from 10 minutes to an hour and half, but never longer than 2 hours. When it freezes I have to force a shutdown by pressing the power button for 3 seconds. If I reboot the computer immediately after this, it won't even boot properly, and stops during the boot process. The fan is always working hard just before a freeze; I know this because my fan is very loud. I have tried different operating systems, but the problem persists. If there is music playing at the time of the freeze, the last second is played in an infinite loop. The last couple of days it freezes during boot as described. When I start the machine from a liveCD it seems to run fine (that's what I am doing right now).
What I did so far:
- I checked the hard disk with SMART Data in the Disk Utility menu – no errors
- I cleaned the interior of the PC, so that there is no more dust
- I have constantly checked the temperature of the CPU just before a freeze and it goes up to about 63 degrees Celsius (145° Fahrenheit), but sometimes I have these temperatures without a freeze
- I ran the CPU burnP5 stress-test and the machine froze maybe three minutes in (the computer is not overclocked and never has been)
- I ran a Memtest86+ – no errors
- OS: Ubuntu 11.10
- CPU: Pentium 4, 3.4GHz
- Graphic Device: Nvidia GeForce 6610 XL
- Memory: 3Gb
- Motherboard: MS-7091 Micro-Star
Does the stress-test failure suggest that the CPU is damaged? How should I proceed?
PS: I don't know how to get memory and motherboard info with the live CD. The 'lshw' command didn't produce anything useful and 'dmidecode' gave me 'Permission denied'.