Chosen Solution
My HP 840 turns on with the HP logo and Bios but after 1-2 seconds turns off. Not reacting on any buttons combinations. Turns on only if I connect the power adapter. Tried to change the battery but not helped. Please help.
It could be the battery or the motherboard of your laptop. Remove the battery then plug in just the charger and turn it on see if it will replicate the problem. If it turns on that means it’s the battery. Also check if it’s your HDD to test if it’s your HDD.
- Remove the HDD off the laptop then turn it on.
- You’ll get an error message saying boot device is missing or something and that’s normal
- See if it will turn off again without the HDD, if it turns off again that means it’s the motherboard.
Either the laptop have short circuit problem or bios problem need flashing
