Random Reboots - No BSOD, No Error Messages

[koberulz]

I have a Windows 8 laptop that I just use whenever I actually need a laptop, which isn't often. As such, it's been a while since I used it last, but it was working fine.

I've just gone to use it today, and as soon as my wallpaper showed up, before the desktop icons had even loaded, after logging in, it rebooted. Did it again the second time. The third time, it managed to last about ten minutes, then rebooted. Since then, it's just been rebooting at random. It reboots if I let it sit on the lock screen. It rebooted when I tried to open Firefox. It rebooted just sitting on the desktop.

It's somewhat difficult to troubleshoot, given it keeps rebooting before I can do much, but I've managed to scour the event viewer and find no trace of any problems other than 'the system shut down unexpectedly' (no kidding!). I've turned off 'automatically restart' in the advanced system settings for a system failure. I've checked, and there's no MEMORY.DMP file. There's never been a BSOD, it just goes straight to a black screen. There's no error message or anything when it boots back up.

Nothing, as far as I know, has changed between the last time I had it functioning perfectly fine, and today. No new software, no new hardware, no nothing.

 

[axe0]

Open an ADMIN command prompt and copy/paste following command

powercfg /batteryreport /output %USERPROFILE%\Desktop\battery_report.html

An HTML file will be generated of the battery usage on the desktop, use a 3rd party uploader to upload the HTML file and post a link from the uploaded HTML file here.

Have you ever pulled the battery out of your laptop? Improper seating of the battery could cause a random reboot/shutdown.

 

[koberulz]

https://dl.dropboxusercontent.com/u/58478872/battery_report.html

No, I've never touched the battery. Don't even know how.

 

[axe0]

Very strange, the design capacity changes very regular.
The design capacity increases and decreases every once in a short while.
Also noticable that the full charge capacity is almost everytime exact the same as the design capacity.

Do you charge the battery everytime you use it? I don't see any drain, only max capacity.

 

[koberulz]

It stays plugged in 99.9% of the time. I had to unplug it briefly to bring it in here and run the command prompt thing, and I had it outside for about five minutes the other day, but mostly it's basically part of my home entertainment unit, so it just stays plugged in with everything else.

 

[axe0]

How old is the laptop?

 

[koberulz]

A touch more than a year.

 

[axe0]

Unplug the laptop, remove the battery and put the battery back in, see if that helps a bit.
You might want to unplug your laptop from charging once in a while.
If you keep your laptop continually connected to a power supply, then you should occasionally allow the battery to drain to about 10 to 20% then reconnect the power supply to charge it back up again.

 

[koberulz]

Took out the battery, put it back in, and left the laptop to run unplugged, and it rebooted again within 15 minutes or so.

 

[axe0]

Remove the battery, plug the laptop without battery and boot.
Does it happen without battery?

 

[koberulz]

No. Or at least it hasn't in the past couple of hours, which is way longer than it's ever lasted since this started happening.

 

[axe0]

Either the connection of the battery or the connection of the laptop is broken or the battery is failing.

 

[koberulz]

It just rebooted without the battery connected, although it took around five hours instead of the usual <20 minutes.

 

[axe0]

[video=youtube;LnTxs0o5CJA]https://www.youtube.com/watch?v=LnTxs0o5CJA[/video]

 

[koberulz]

I don't have one of those things, so I haven't done that, but I just tried to boot it up (battery still not connected), and it won't boot, the Caps Lock light just flashes.

 

[axe0]

Please get a multimeter and test your PSU.

 

[koberulz]

Tested it, it's fine.