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I've recently had a problem with my laptop. All I've been running is Opera and Amarok, but I don't think they are the problem. All that happens is randomly the screen goes black, and then back to normal again, but I can do anything. I can't move the mouse or type anything. I have to turn it off by the power button. I have no idea what is causing this, because I haven't installed anything big recently...
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It may be a hardware problem.
When the system doesn't respond, can you kill xorg with ctrl-alt backspace, or reset the system with a magic sysrq (which you have to enable in /etc/sysctl.conf) or as root temporarily:
echo 1 > /proc/sys/kernel/sysrq
If it does not respond to the above controls, and you find nothing in logfiles from the time you have these crashes, it is probably a hardware issue (since your drivers havn't changed, or have they?).
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Killing Xorg doesn't help, because the keyboard doesn't respond. Where can I find logfiles to check?
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Sometimes, xorg doesn't pass the keys on, but it can still be killed with M-C backspace, or SysRq k.
various files in /var/log particularly everything.log.
but since you haven't changed anything, it's probably a hardware issue.
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