So a bit of background, I have been having several issues with my laptop. The first has been a severe overheating issue at times, though I was able to help solve the problem by using a laptop cooling pad for a time. Eventually though even that wasn't helping, and neither was trying to clean out the heat sinks using compressed air (I refuse to blow the dust back into the laptop). Being the laptop was already out of warranty, I disassembled the laptop down to the motherboard (which I have to say, thanks Toshiba for refusing to release any of your service manuals). I opened up the heat sinks, thoroughly cleaned out the heat sinks, reapplied thermal paste to both the GPU and CPU, and reassembled the laptop. Using Core Temp and a GPU monitor, my temps are well within normal operating range. However, I am still having issues. Now when I start my laptop up, if my battery is plugged in and the AC adapter is plugged in, the computer will shut down without any notice within a few minutes. The lights on the LEDs on the front turn off (even though its plugged in) and will not restart without removing both the battery and power being removed, hitting the power button a couple times and plugging it back in. Now if I don't have my battery plugged in, it lasts a lot longer, but still shuts off periodically for no reason, and has to be unplugged and hit the power, etc. However, when I left my computer plugged in and running this morning (no battery), it sat there for a couple hours with no problem. I moved it onto my lap, and it shut off. I'm curious to what some possible solutions to this could be. It's possible I reassembled it wrong (though everything seems to be working, all the buttons, etc), but it seems like something is causing the system to crash and lock out. I don't know if its software or hardware related, I'm considering reinstalling Windows to see if that helps, but I wanted to check in first to see if anyone else has a solution without going that far.