Sorry, no screenshots this time.
A few days ago I was called because a guys laptop wouldn't boot up. This was an HP. It seemed completely dead. Then I noticed a little light that came on where the power goes plugged in and another little light on the other side that indicated that there was power going through the system.
So I held down on the power button for five seconds. But it didn't help. So I repeated the procedure waiting a little bit longer every time. No luck.
So I decided I needed to do an hard reset of the power, that is, unplug it, remove the battery, hold down on the power button for about 30 seconds, plug it in again and try turning it on. One downside here.
It was one of those completely enclosed, no easy access panels type models. The ones manufacturers design to make you sweat trying to get at their insides. :-)
But recently I wrote about dissecting a similar model here: davescomputertips.com/changing-a-hard-drive-in-hp-notebook-15
or ...
Changing A Hard Drive In HP Notebook – 15-bs023ca / Fix Flashing Circles And Erratic Mouse
This procedure was basically the same, remove the screws, pry open the case. Then I had to unscrew the battery and remove it. I pressed on the power button for 30 seconds. Then plugged in the power cord and tried to turn it on.
It didn't work the first time but I gave it a second shot. Sometimes then procedure might need to be repeated a few times. In my case, the computer started booting up after the second try.
So, I unplugged it and put the battery back in. Turned it on again to make sure it was still working. It was. Snapped the casing back into place. Try it again still working. Replaced on the screws and finally, tried it again. Still working.
Apparently this problem is caused by a likely power surge and the safety mechanism built into the motherboard, to prevent overloads and burnouts, disconnects the power.
Another laptop given a second chance.
And for more laptop troubleshooting, click here davescomputertips.com/?s=laptop