Thread: Ubuntu 12.04 constantly reboots.

i have switched ubuntu 10.10 12.04. after doing this, computer reboots several times day , has never acted way before. have average uptime of 3 weeks previous distros on same hardware.

@ point can safely not temperature or fan related issue.

when system reboots, restarts , stays stuck on normal motherboard boot screen. @ point hard reset , when comes on i'll see screenshot of monitor displaying @ moment reset. flashes on second , goes login screen.

'mostly-horizontal, bad-tv-reception-static lines' going across screen evey time start computer since using 12.04. i've seen mentioned in these forums before , i'm trying provide more information. 'static screen' displays right before login screen comes on (even on normal start-up)

before go on, here's of system information:

code:

ubuntu 12.04.1 lts precise 32-bit  kernel linux 3.2.0-32-generic-pae (i686)  gnome 3.4.2  processor: amd phenom(tm) ii x4 965 processor × 4  biostar motherboard  4gb 1333mhz ram  hitachi deskstar 3.5 serial ata internal hdd 1tb

i able recreate crash consistently in 3 different ways @ moment:

*always restarts little bit after starting rip dvd in handbrake.

*always restarts after uploading specific .png image specific site add captions (firefox).

*always restarts when moving files 1 (encrypted, internal) hdd, main (encrypted, internal) hdd. move them external usb drive, hdd , works.



3 ways can recreate problem consistently, it's rebooted during lots of other times such as:

*using default image viewer (alone).
*using vlc (alone).
*using flash in firefox alone (several times, cannot recreate it).
*just starting firefox
*while installing updates in update manager (/usr/bin/update-manager).
*during other normal/basic operations can't remember exactly.

using update manager today, installed apparmor update , rebooted several times while trying install (everything ok point). when reboot myself, every time tried "/usr/bin/update-manager" crash , reboot right away. finished update using update option in task bar , have not tired opening update manager since.

also, while doing @ same time today, began writing post on leafpad (text editor). now, since it's crashed many times, leafpad won't start anymore.

attached "syslog" last 2 hours or so. when apparmor update crashed several times, firefox crashed tried open , leafpad stopped working. tried add post first, timed out trying preview. tried attach txt file had cut 389.1 kb 19.5 kb of missing.


1 more detail can think of add:

once when reset while using handbrake, motherboard screen said: "coms checksum bad" , had tell bios drives boot again restart.


not savvy ubuntu user out there if point me in right direction troubleshoot appreciated. questions are:

how can troubleshoot rebooting business , try stable again?

, (extra credit question), ideas on how leafpad working again?

thanks!

attached files

• syslog system log.txt (18.6 kb, 3 views)

all of you're saying (random reboots, images os displaying on bios messages, cmos corruption) saying 'hardware issue' me. happens if pop onto distro (live cd or whatever) while?

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