I apologize in advance if this should be posted in a different forum. Please move it if so.
I have a Dell XPS Studio 7100 on which I just installed Lubuntu 18.04. It has begun doing a spontaneous reboot every so often. I have a 430 watt power supply, one HD, 2 DVD drives, and a Radeon X300se graphics card. I switched out the CMOS, in case that was the problem, and it didn't seem to change anything.
Also, the syslog hadn't updated since 9:18a yesterday morning, and I had the PC on for 3 hours after that (spontaneously rebooting every 20 - 30 minutes).
Not sure if these two issues are connected, but wanted to share them both in case it helps point out the issue.
This morning, I removed the Radeon card and the system hasn't rebooted since. Also, the syslog is updating regularly. I performed a memtest and it passed with no errors.
Does anyone have any ideas of possible problems and/or solutions? I would really like to use the x300se card as it will allow me to have dual monitors. Is it possible that 430 watts is not enough of a PSU to support that and the other hardware listed? Or possibly I need different drivers? All other aspects of the system were great....until it rebooted again.