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Laptop randomly reboots



I'll try to keep this short. I bought a used Lenovo T520 back in May. It had the motherboard with nvidia GPU. Because it sucks power and doesn't really have good suspend/resume support, I bought a used mother board off of ebay that only had intel integrated graphics and I swapped it out. All was well and I had installed in it 8gb +4gb of ram.

It ran like that for about 8 weeks before I bought an 8gb stick and stuck that in, so then I had 8gb + 8gb of ram. After about 6 weeks of running like, it randomly rebooted overnight. I shrugged it off and thought maybe the power went out or something (even though it had a battery in it). But then about 2 weeks later it did it again..and then two weeks after that. So I pulled out the new 8gb stick I had put in and let it run with just one 8gb stick. It ran like that for about 10 weeks without a problem. I put the old 4gb stick in just for fun, bringing it back to the original 8gb + 4gb configuration. But about 2 weeks later it rebooted again. At that point I bought a matched 16gb kit (8gb + 8gb) from new egg that seemed to come recommended from google searching for compatible ram for this model. But just a couple of days ago (about 3 weeks after installing it), it rebooted by itself.

I am kind of at a loss here now. I can buy another motherboard and swap it out again, but that takes a few hours and I don't feel like doing it. The cooling and thermal stuff is all good on the laptop,I've ran prime95 and video encoding for hours and it is fine (temps stay below 80* at least, normal usage is 40-55*). I've also ran memtest for a few hours.

What I find weird is that the machine suddenly reboots. At least a few years ago, ram issues would just lead to a kernel panic screen. But with this, the machine is just like someone pulled the plug and rebooted it. I started to wonder if there is some built in watchdog somewhere that will reboot the machine if it hangs, but I can't tell? Other than that, if this is the kernel that is rebooting the machine, is there any way I can get it to dump some info somewhere before it fully reboots? Before I go through the pain of swapping the board again, I'd just like to really know that this is a hardware issue and not the kernel detecting something and just choosing to reboot...

Thanks for any info,

Sam


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