When I start my laptop, it turns on briefly and then off again. Have just screwed laptop clean and made Power Button and when I start now is exactly the same 1sec on and then off again
Change the bios battery once
It may be when the laptop is relatively old, that the bios battery is low, or that the battery is through. There can be an infinite number of errors as a PC is a VERY VERY complex system. Just order a new battery and install a new battery.
* Tip * The Bios batteries are mostly the same as the cheapest LED strips. Usually enough already.
Greet Norman
Sometimes it is enough to take out the battery and the BIOS battery for 5 minutes and then insert it again. This will (mostly) reset the BIOS, and the problem will be done by itself.
Especially in laptops, BIOS batteries are often not easily accessible and / or shrink-wrapped and cabled. Possibly. So fiddly. At the end of the cable but then a plug to the motherboard, you just have to pull. The biggest hurdle is usually the opening of the device and the approach to the battery or the plug.